How to Design an Energy‑Efficient Home: Insulation, Air Sealing and Panelized Construction Explained

Show Notes:

“Green,” “sustainable,” “net‑zero,” and “solar‑ready” get thrown around a lot, but what do they actually mean when you’re designing and building a panelized home? In this episode, Steve breaks the concepts down into practical terms for owner‑builders. He explains how Landmark’s structural package already uses renewable, engineered wood products from regenerating forests, and how true energy efficiency goes far beyond just adding insulation—it requires designing the home so required insulation, ductwork, and mechanical systems actually fit and work as modeled, and then making sure they’re installed correctly. Steve walks through how window choices, air sealing, duct design, venting, and even small penetrations (hose bibs, outlets, doorbells) affect performance, and how Landmark’s plans incorporate energy‑code requirements while still staying within realistic budgets. He also clarifies the difference between “sustainable materials,” “green building,” “net‑zero homes,” and “solar‑ready” design, and shows how simple design moves like roof overhangs, orientation, and energy‑heel trusses can boost performance without exotic tech. Throughout, the focus stays on building a sensible, energy‑efficient home that’s comfortable to live in, affordable to build, and ready for future upgrades like solar—without getting lost in buzzwords or greenwashing.

Transcript:

Steve Tuma: We’re not using exotic woods. You don’t have Brazilian rosewood in the house. We’ve got SPF or Doug fir, or yellow pine that comes from forests that are regenerated so it’s available — we’re not depleting things that can’t be renewed.

Interviewer: Greetings everyone, and welcome to Episode 85 of the Panelized Prefab Kit Home Building Show.

With me today, as he usually is, is the President and Founder of Landmark Home and Land Company — a company which has been helping people build their new homes where they want, exactly as they want, in all 50 states and around the globe. And yeah, and we’re happy to have him back here today, Mr. Steve Tuma.

Steve, how are you, young man?

Steve Tuma: Just doing great. Just doing great — helping people build houses, design houses. I have some interesting ones — some people trying to really, really control the costs, make sure they get the houses. And then we’ve got other people that want to really push the limits on some design and energy efficiency and different details.

So it’s a new day every day. Every project is different, and we take the time to see what a customer needs and help them through it.

Interviewer: Well that’s what you guys have been all about for over three decades — seeing what people need and give it to them, right?

Steve Tuma: Get them the coolest house.

Interviewer: So today I thought we’d discuss panelized homebuilding and how it can work in the — well, let’s just call it the “green” area. The sustainable design and energy‑efficient homebuilding, and how Landmark can help people facilitate that.

So if you’re good to go with that, let’s kick it off.

Steve Tuma: Yeah. Well Landmark Home and Land Company — a lot of the materials are already sustainable. All the wood materials come from forests that are regenerated, replanted, and grow. So that’s just the nature of it. So our actual products are like that.

And then a lot of it — engineered materials. Say, like in the old days, you might have a 6×6 or something, or 10×12 or something, and took a big piece of wood. In today’s world, like beams — instead of needing a solid, say, 6×12, you can have engineered materials that can be made of smaller pieces of wood that create actually a stronger support system.

So just in the nature of the engineered woods — OSB, plywood, LVLs, PSLs, glulam beams — we’re able to work with materials that are regenerated but also more economical to use for the intended use.

So that’s a pretty cool thing about it that I think is just amazing — the industry, the lumber industry in a sense, has already created a lot of that.

Now sometimes people come through and say, “Well, I got this exotic wood from here and exotic wood from there.” Well, it may not be as sustainable, some of those materials. But people can make a choice of what goes into it. But everything that Landmark Home and Land Company supplies comes from a sustainable forest, which is pretty amazing.

And, you know, so we’re not really doing anything to damage — they’re just regenerating and growing it.

And then you brought up the energy efficiency, which is kind of, I would say, related — make sure that we keep the environment as good as we can.

A lot of people think energy efficiency is like insulation — which it is; insulation will stop the transfer of heat or cold, or slow down the transfer of heat or cold. But we can also get into the design and efficiencies for heating and cooling systems, whether it’s conventional HVAC, heat pumps, mini‑split systems, to make sure that someone’s got a properly designed system, to make sure that the equipment isn’t running too much or too little.

And then there’s also details on types of windows — the energy‑efficiency factors, the R‑values of windows, the U‑value of the complete window or door. Those are details that we have for energy efficiency.

And then we can also get into something that not a lot of people think about — sun analysis, the orientation of the house to the sun, prevailing winds, different things like that — so that:

In the low sun in winter, it kind of gets in your windows and heats the house
But the higher sun in summer, we put overhangs or position the house to keep sun from going in and then creating additional heat that you would need to cool

So there’s a lot of variables that we can get involved with in the actual design of a home, to make sure it’s sustainable materials and energy‑efficient.

Now, different states have different levels of energy calculations. Some of them are very simple and don’t consider sun, don’t consider a lot with your mechanical systems. And others — like California — are very detailed, where you need to have a net‑zero home. Basically what you have to do is make sure that the house can generate enough power for itself — basically electric.

So we’re able to work at whatever span someone wants to do — if they want to have more of a simpler energy calculation, or if they want to get really, really deep into doing net zero, we can do it.

Of course, as you get more efficient, it costs more. So there’s always a balance and a decision as to how deep a customer wants to get into it. But it is something we automatically do as part of our design process — make sure that a home is energy‑efficient so it meets or exceeds the codes, and it’s a sensible home for a family to own. Because you don’t want to build a house and then find out the utility bills are going to knock your socks off. You want to make sure that it’s built right.

And it’s not just the bills — it’s the comfort, it’s the enjoyment of the home. Details like that. We want to build a sensible home all the way around, so:

Architecturally
Structurally
In an energy‑efficient way
Sustainable
And enjoyable for the family

It’s a lot of thinking that we do in this process. But the energy efficiency, amazingly — it is a big thing of a home. It’s not always something that a customer completely understands, so we’re able to go through and make sure that the energy‑efficiency requirements are taken care of properly. And if a customer wants to go beyond, we’re more than willing to help them.

Interviewer: So yeah, when — let’s say a prospective customer calls you guys — you talk them through these things.

So let’s have you talk us through it as much as you can right now. Just talk to me like I am a complete novice when it comes to building. Just: what does energy efficiency and sustainability mean, in general terms, regarding a panelized home?

Steve Tuma: Well, the sustainability are the materials. So the simplicity thing is: we’re not using exotic woods. You don’t have Brazilian rosewood in the house. We’ve got SPF or Doug fir that comes from — or yellow pine — that comes from forests that are regenerated. So it’s available. We’re not depleting things that can’t be renewed. So that’s in the sustainable part.

The energy‑efficiency part is in the actual design of the home. So it’s not just the energy calculation; it’s also making sure that the insulation that an energy calculation requests can actually be put into the design of a home.

In some areas, you have to design — say, in very cold areas — you’ve got to put insulation around footers in certain ways, so that’s underground. Not everyone thinks of that. Very few people think of it. Sometimes you have to put it underneath the slab. Sometimes you have to have a certain amount in a wall or a roofline, an eave overhang, and we’ve got to tie all these details together to make sure that it works.

Because one thing that gets involved in the design is sometimes an energy calculation will specify a certain insulation — you have to make sure that there’s space in the wall or roof or floor or foundation to install that insulation, and it can properly be taken care of and will work effectively now and in the future.

And that’s the thing that maybe not all people realize — this gets a little deeper than just doing a calculation and saying, “Hey, my house is energy‑efficient.” It’s making sure that it’s designed right.

And then when you get into the efficiency, it’s also making sure it’s installed right. So the simple situation is, people generally know the bat insulation, the pink insulation, yellow, whatever color it may be — it operates at a certain performance when installed properly, basically meaning it’s not damaged, it’s not compressed.

So if you take an R‑21 insulation bat and compress it, it’s not R‑21. It’s the air spaces within that that allow it to minimize or control the hot or cold transfer. So people have to know to install the insulation right.

It’s the same thing with heating systems — with ductwork — make sure that:

The heat calculations are done right (heat‑loss calculations)
The equipment sizing
Make sure the ductwork is right
Make sure that the vents are designed right

But then also make sure it’s installed right. So you could have ductwork with little holes in it — so if a dollar of your heat comes out of the furnace, by the time it gets, say, across the house in your living room, is only 40 cents getting there.

So you’ve got to have the right ducts, make sure they’re sealed properly, to make sure heat actually gets transferred to the place you need it to be.

So there’s a lot of details. There’s other little things that people don’t realize. A lot of times — especially in places where it’s not monitored — someone will go through and put a little spigot through the side of the house for a little faucet, for the hose bib. Well, they don’t seal around that. So essentially there’s an air leak going into your house where that hose bib is, or an outside socket, or your doorbell.

So there’s the efficiencies in making sure that the energy calculations are followed by a proper installation of the insulation — it’s kind of a tongue twister — but the ducts, proper venting systems, venting systems in the roof. There’s a whole sequence to this which we do include in our plans.

So I know that that’s — for someone that may have heard that the first time — there might be a lot going on there. But it’s basically the concept: design it right, make sure it works in the house, then make sure it’s installed right so it can work properly.

And a lot of places, they’ll actually do blower‑door tests or have HERS raters or other people go through the houses to make sure that the energy calculations are complied with, to make sure it’s there.

So what a lot of people don’t realize is there’s a process to understanding what needs to be done — but then making sure that it gets done, for that true energy efficiency. Because you could have the best insulation on earth — if it’s not installed right, it’s not going to work right.

Interviewer: So I thought that was pretty good, pretty concise explanation for somebody who may not have a clue what exactly goes into that whole concept of energy efficiency and sustainability.

I mean, it’s — you know, those words are bandied about so much, you know — I mean, who knows sometimes what these things mean.

Steve Tuma: Right. And people have to look at it, because just because you get the most insulated front door, you’ve got to make sure it’s installed right, make sure it seals right, make sure it’s done right so that the door can do its job.

And a lot of situations happen where the installation of these materials isn’t right. So some customers will go to a degree of getting a secondary consultant to review these details to make sure that it’s done. And in some states, where it gets to be a little more hardcore, they actually demand in some cases that you get a third‑party inspector out there to make sure that it’s done — because not all people do their job right.

We’ll design it right, but our owner‑builder customers have to work to make sure it gets installed right. But we’ll help them through the process, and that’s a big thing of what we do by helping owner‑builders with our great panelized home systems — have the customer understand what they’re doing, so it minimizes their learning curve, so it’s easier for them to understand what they’re going to.

And we’re also always available to help customers go through the process — as they build their home or as they design the home — to make sure that they get through the issues that they need.

Customer support is our big thing at Landmark Home & Land Company. That’s the biggest thing that we’re able to help. People find us because of panelized homes or kit homes or owner‑builder homes — but I think the reason they really enjoy working with us is the level of knowledge and support, so we can help them through the process for:

Their exact home
On their exact building site
For the home that they want

That’s the key to all of this.

Interviewer: Well, while we’re defining terms, let’s go ahead and keep going. Define a couple more for us once and for all.

There are two terms: “net zero ready homes” and “sustainable construction.” And if you wouldn’t mind going through that, I know I’d be kind of grateful.

Steve Tuma: Well, the sustainable construction — we’ve kind of gone over. And that’s basically using materials that come from sustainable sources. You know, so that’s it — like the wood, it gets regenerated. Simple as that. There’s sometimes recycled materials — so something sustainable means it can be regenerated. You know, if you cut a tree down, you plant another one, that type of a thing.

But I think you could also blend a little into it — some recycled materials. I’ve seen countertops made of materials that are recycled. I’ve seen different things like that happen, so that I think people can check the materials that they’re buying to see what is sustainable or not.

Now, the other part of net‑zero — that’s basically where the building generates its own power. And generally that’s done through solar. And in most cases, where there’s enough solar electricity developed and saved so that it powers the home throughout the course of a year.

Now of course there are going to be some places where it’s shady two days or a week or whatever, and maybe there’s battery backups — but that’s the idea, that the house generates the power that it needs to operate. And those are all theoretical calculations that are put together. And then there are certain design elements that are put there to understand:

How much hot water is going to be used
How much electric’s going to be used
What type of power does a stove need
What type of power does a dryer need
What type of power does a hot water heater need

So there’s different technologies coming out. Like, what was interesting is a few years ago, California wanted everyone to use gas hot‑water heaters. Well, now they’ve come out with hybrid heat‑pump water heaters that run on electric, and the energy calculations are now switching people to go to the electric heat pumps.

So there’s different technologies that are being developed and then just different forces — where the building departments are making suggestions on the power that’s there. That’s a whole different debate — on how much the government needs to be involved in the design of a home. But in the cases where it’s more controlled — like California — we’re perfectly set up to take care of them and do an analysis of the home to make sure that the home is energy‑efficient and complies or exceeds the guidelines.

And then there’s a lot of other parts of the country where the building departments may not even look at the energy calculations or may not even request them. But even so, we want to know it’s done right — because it’s the customer’s utility bill, it’s the customer’s enjoyment, it’s also the customer’s comfort in a house where, you know, it’s warm or cool to the satisfaction of their needs for the season.

So it’s — I think we’re kind of getting around to, “Hey overall, what are we doing that makes sense?” You know, as much as reasonable, in building the home so we’re not damaging the environment, but also having the balance of making a house that makes sense and can still be affordable. Because there’s a lot of leading‑edge green technology out there that’s very expensive, that most people aren’t going to want to be able to put in their budget.

Interviewer: Well, one more definition here — because they… I mean, just to follow up, is there a difference between “green building materials” and “sustainable building materials” and “eco‑friendly custom homes” as opposed to “net zero ready homes”? I mean, these things start becoming a little bungled.

Steve Tuma: Well, that’s the thing about it. I’m sure that there’s some society of someone out there that has an extreme definition. But to me it goes down to making sure the house makes sense.

Try to use renewable sources. Try to make it as energy‑efficient as possible while still being able to afford the house. So I think there’s a lot of these little things that have become buzzwords. But if you really look at it — how much of it can really be put into the budget?

How many people can go spend an extra $50,000, $100,000 for solar arrays to save a little? And are they even in an area where it could be efficient? So that’s one of the things that a lot of people have to balance out.

But I do notice overall, the people — if it’s something they want to do, they figure out a way to do it. Or if they say, “Hey, it’s not in the budget now, but it will be next year” — we can set the house up for solar so that when they get to the point of putting the panels on, the roof trusses, the structure of the home are strong enough to support it, and there’s a façade of a roof or something — or I should say, a portion of the roof — that faces the sun.

Or some customers have actually put their solar arrays on the ground — more on different stands if they don’t want it on the roof. So we’re able to work with people on if it’s something they want to do now or something they want to do in the future.

But I agree with what you’re saying, where it’s all bungled — there’s so many different: there’s green, there’s sustainable, there’s this — and where does one become another?

I kind of simplify to say: let’s do a house that makes sense for what the people want to do. We’re always going to work for energy efficiency. We’re always going to work for sustainable materials. It’s just part of what we do normally. It’s part of our game that we just supply. We don’t really toot our horn a lot about it — maybe we should — but it’s part of what we do to take care of it.

And by the way, it was interesting — we’ve done some projects in Europe. Their energy codes are tighter than what the tightest ones are. So it’s — we’re up for it. And we’ve done it. We’ve been doing it for 32 years.

Interviewer: A lot of it comes down to trust. I mean, you know, they trust you. So I would rather have somebody say, “Let’s build a house that makes sense,” rather than to go into all the ins and outs of green and sustainable and all these terms.

Steve Tuma: It gets complex. And — I hate to say it — some of it’s just greenwashing. Just use the buzzword, use the buzzword. And I’m like, okay, that’s great, but what can we really do to make an effect and still have a well‑built home?

And sometimes it’s just paying a little attention to an energy heel on a roof truss — it gives a little more space for insulation. Sometimes it’s just sitting back going, “Hey, we only have this much space, we have to use this type of insulation,” or, “Hey, that insulation costs more, so we need to adjust something somewhere else to make sure that the home as a unit is energy‑efficient.”

So there’s a lot of calculating and working and just balancing out — working with the customer to make sure it’s taken care of. So it’s not hard; it just takes a little bit more time to think it through and make sure it’s put together right.

We’re able to work with the energy calculations, the architectural and structural design, to make sure that the energy efficiency ends up where it needs to be, and also makes sense for the customer and the home that they’re building and the budget that they desire to stay within.

Interviewer: Yeah, that makes sense. So I’m going to throw some more — thanks for your patience on this — but what is a solar‑energy‑ready design, and is that hard to accomplish, and how does it fit into the term “green construction”?

Steve Tuma: Well the “green” is that you’re using the sun as the power instead of, you know, nuclear, fossil fuels or things like that. The sun’s — I think it comes up every day and goes down every night, so it’s there.

So the solar‑ready is something, like I mentioned — if someone doesn’t want to put the solar panels on now, but maybe they’ll do it in a year or two, we could design the home so that there’s:

A portion of the roof that faces the sun
And the structure is strong enough for it

But again, like all of these, it’s: how deep do you want to go? We could get into analyzing overhangs, orienting the house different ways to be more energy‑efficient — to either take advantage of the sun or keep the sun out if you’re in a hotter climate.

So there’s a whole bunch of different situations on:

Orientations on site plans
Lengths of overhangs
Positions of windows
Passive‑solar designs
Heat sinks — cement floors

So sun comes in through a glass onto a cement floor. It heats that floor up, so then at night, when the sun’s gone, the heat comes out of the floor. Or it could be a wall — it could be whatever it is. But those are things that we can work on. It all really depends on how deep a customer chooses to get into it, because the design work and expense that can come with some of this can sometimes be a little bit more.

Other times you can do things really simply. Like, instead of 1‑foot overhangs on a roof, let’s make it 2‑foot. It’s not a big deal. In fact, I probably wouldn’t even charge for it. We’d just do it if customers ask.

Putting an energy‑heel truss on there — there’s a lot of different situations that we can take care of that we actually just build into the design of our homes.

But sometimes there’s restrictions on what you can and can’t do. One thing which is interesting about taking advantage of the sun is if you were — like with your great‑great‑grandparents, say they were farmers — there’s a lot of space there. So they can say, “Hey, let’s face the house this way to take advantage of sun, take advantage of the breeze.”

Well, in the advent of subdivisions and city layouts, the cuts are cut for the efficiency of the real estate, to sell the real estate. So you can’t exactly go on a, you know, a 75 by 200 lot or 200 by 200 lot and have a perfect orientation for the sun. Sometimes it just doesn’t work. You can’t fit it in the lot.

Well, as I’m rambling here — but we also have a lot of places where we’ve worked where communities have restrictions on how much sunlight your house can block. People want vitamin D. Sun is good for people. So you can’t have something that blocks a big portion of the sky.

So sometimes we’ve got to get into designs and explain how tall a building can be, or only a certain part of it can be tall, so that the sun can still pass through the neighborhood — so you don’t have dark, canyon neighborhoods without any sun.

So sometimes the “green,” I think, can be saving energy or sustainable. But sometimes I think it gets into: how enjoyable is your neighborhood?

Do you have a backyard? Do you have a front porch? Do you have a place to talk to neighbors? Can you be part of the community?

And more and more people are being involved with that part of the design, which I think is pretty cool and interesting — of saying, “Hey, this isn’t just a place to sleep and feed the dog and park my car. I want to live here and flourish and have a great environment to live in.”

So, you know, this can go on and on — but it’s pretty interesting to see what we do to help customers, but also what customers are asking for. They want to have a good lifestyle. They might want to be in a community where they walk a lot. They might want to be in a community where they could ride bikes.

We’ve had a lot of people build houses in areas — you know, mountain areas or areas with water — so that it’s accessible. People can have easy access for their bikes or whatever equipment they need. Or horses — equestrian properties, where people have designed certain things for the enjoyment of the horses and the community around them.

So I’ll make this revelation that “green,” I think, goes beyond power. It goes beyond — it goes into a quality of life and people enjoying life and community.

Interviewer: Hmm. No, it makes sense. I guess we got a little deep there.

I think that the overall here is: when we talk “green,” we’re talking about saving money in the long run. I mean sustainable building is going to bring down your long‑term utility costs, for say — you know, I mean —

Steve Tuma: Right.

Interviewer: — and that, I would imagine, can help the resale value of your home.

Steve Tuma: Yes. I would say that it’s an important thing. Because if someone sees that there’s an energy‑efficient, well‑built home — good windows — that’s going to help the sale of the home. And then it makes sense — you don’t have to go in and rebuild it.

So I think it makes sense. Now, what’s interesting — I’ve looked at real estate ads, I’ve looked at stuff, and I don’t — I don’t want to cut it down — but I don’t think I’ve ever seen a bank that says, “This is an energy‑efficient home. We’ll help you with a better mortgage.”

So there’s a point where, if you push too far, you’re going to end up paying for it, you know, if you’re getting a loan. So if you’re putting, you know, a certain excess of green into your house and it goes beyond an appraised value of a property, you know, someone might have to pay cash. Because I’ve never really seen a bank that says, “Hey, we’ll give you a little extra money to really build it right.”

So that, I think, is why a system like ours makes sense — because we’re able to work through, with the design, the engineering, to make sure we can put as much energy efficiency in there at a cost that’s reasonable for people’s budgets, reasonable for financing, and makes sense in the long term — make sense for buildability and make sense for maintenance as well. It’s an important component, I would imagine.

Interviewer: All right. Well that’s about all we have time for for this edition of the Panelized Prefab Kit Home Building Show.

But before we let you go, Steve, as we always do, let me ask you to tell the listeners how they can find out more about Landmark Home and Land Company.

Steve Tuma: The best thing, I think, is our website. We’ve spent a lot of time over the decades developing a website that I think is very informative, and people can look at it at LHLC.com. The company name is Landmark Home and Land Company — of course we’re the best panelized home designer and supplier in the world, we know it — but you can go to the website at LHLC.com — again, LHLC.com — and see the videos, listen to some of these podcasts, see a whole variety of different plans, details of what we supply and how we supply and things like that.

You can then also send us an email from there. You can also look at different plans and go through and submit an inquiry, say, “Hey, I want to build this house, it’s plan number whatever, and I want to build this location — let’s talk about it.” So we’re able to go through and work off email inquiries.

Or you can call in at 800‑830‑9788, and Mike will answer the phone and he’ll be able to walk you through the process to see what we can do to help you and how we help you. And then, at a certain point, I’ll start working with you to get all the plans going, finalize the details, and get everything taken care of properly in a way that you understand and achieves your goals.

So that’s the best thing to do. And if someone wants to call me direct, I’ve got my cell phone: 708‑205‑2043.

Interviewer: Pretty cool. Well, there it is. Thank you again, Steve, and thanks to all of you for listening to the Panelized Prefab Kit Home Building Show.

So for Landmark Home & Land Company President Steve Tuma and for myself, have a great week ahead and we will see you next time.

Steve, thanks a lot.

Steve Tuma: Thank you. Let’s go be green.