In the San Luis Valley, a comfortable building has to do more than produce heat. It has to hold onto that heat through cold nights and long winters. Whether you’re planning a new home, building a shop, or remodeling an older space, the choices you make before the walls are finished can affect your heating costs for years.
A good place to start is the building envelope: the walls, roof, floors, windows, and doors that separate your heated space from the outdoors. Insulation is a big part of that picture, but it works best when you also address drafts, sunlight, and how the building will be heated.
Make insulation a priority
If you’re opening up walls during a remodel or starting a new build, take a close look at the insulation plan. Where will the building lose heat? Are there spaces above the ceiling or below the floor that need attention? What insulation will fit each part of the project?
Knauf Performance+ EcoBatt insulation is a fiberglass batt option to explore for walls, ceilings, and floors. It comes in different sizes and R-values, so you can choose a product suited to the space you’re insulating. Our team at Alamosa Building Supply and La Jara Trading Post can help you identify what your project calls for and estimate how much you need.
Planning an insulation project this fall? Knauf insulation is 10% off at Alamosa Building Supply and La Jara Trading Post from October 1–31, 2026. It’s a good opportunity to get materials lined up before the coldest part of the year.
The product you choose is only part of the job. Insulation needs to fit around framing, wiring, and pipes without leaving gaps or being compressed. Those details are easy to overlook once drywall is up, so it pays to give them attention while the space is still accessible.
Stop warm air from escaping
Have you ever stood near a window, door, or outlet and felt cold air moving through the room? That draft is a clue that heated air may be escaping and outdoor air is getting in.
Air leaks can occur around window and door frames, attic openings, plumbing penetrations, and other places where materials meet. That’s why insulation and air sealing belong in the same conversation. According to the U.S. Department of Energy, sealing air leaks and adding insulation can improve a home’s comfort and energy efficiency.
For a new build, ask your builder how these areas will be sealed before they’re covered. For a remodel, pay attention to drafts in the rooms where you’re already doing work. Fixing a gap is often much easier while the wall or ceiling is open.
Think about the sun before you place the building
If you’re planning a new home or shop, consider its orientation early. Where will winter sunlight enter? Which side faces the prevailing wind? Will nearby trees, buildings, or mountains shade the space during the coldest months?
South-facing windows can bring in welcome winter sun, especially in rooms you use during the day. But sunlight alone won’t make a building efficient. Window size, insulation, shading, and summer comfort all matter. A large expanse of glass may look appealing, but it can also make a room harder to keep comfortable if it isn’t chosen and placed thoughtfully.
Walk the site at different times of day if you can. Think about where you want natural light, where you’ll need privacy, and whether an overhang or other shade could help manage summer sun. Your builder or designer can help turn those observations into a layout that works for your property.
Choose window placement with purpose
Windows do more than frame a view. Their placement affects sunlight, drafts, and how a room feels throughout the day. Before settling on a layout, ask what each window needs to accomplish. Is it there for a mountain view, daylight in a workspace, or winter sun in a living area?
When comparing products, look at energy performance ratings along with size and style. The Department of Energy’s guide to window and door ratings explains the numbers you’ll see while shopping. Careful installation and sealing around each frame are also essential. When comparing windows, look at energy performance ratings along with size, style, and how each window will be installed and sealed. At La Jara Trading Post we carry Marvin Windows, which has great solutions for challenging installs. You can also check out Milgard Windows at Alamosa Building Supply. There are many high quality options, and the Milgard Fall 2026 promotion offers an electronic gift card rebate on qualifying V300 Trinsic or V400 Tuscany windows: $200 when you buy 5–9, $600 for 10–14, or $1,000 for 15 or more. The offer runs through October 31, 2026 at Alamosa Building Supply. Talk to our team about window options for your project and the promotion’s eligibility requirements.
Doors deserve the same attention. You can explore Therma-Tru’s energy-efficient door options for an entry that fits your project. An insulated door is a useful starting point, but it should also fit properly and close against effective weatherstripping.
Consider insulated wall options for a new build
If you’re still deciding how to build, the wall system itself is worth discussing. Fox Blocks insulated concrete forms combine concrete walls with insulation. They may be an option for a home, shop, or other building where you want to plan for energy performance from the start.
There are other ways to add insulation to a building assembly, too. Kingspan GreenGuard includes rigid insulation products that can be considered for certain applications. The right approach depends on the design, budget, and details of the project. Talk with your builder about where each product would go and how it would work with the rest of the wall or foundation.
If you’re comparing options, think beyond the cost of one material. Ask what the complete installation involves and how the finished space will perform through an SLV winter.
Match the heating system to the building
Insulation and air sealing affect how much heat a building needs. That’s one reason to involve an HVAC professional while the plans are still taking shape. If you choose the heating equipment before the window, insulation, and layout decisions are settled, it may be difficult to size the system appropriately.
Ask your HVAC contractor to calculate the heating needs of the finished building rather than relying only on its square footage. Share the insulation plan, window choices, and any changes you’re making during a remodel. Discuss how heat will reach each room and where ducts or other equipment will go before construction limits your options.
It’s also worth talking about ventilation. As you make a building more airtight, you still need a plan for fresh air and moisture control. Your builder and HVAC contractor can help you choose an approach that fits the space.
Plan before the walls close up
Some of the best opportunities to improve comfort happen early in a project. Before materials are ordered, ask where insulation will go, what might be difficult to reach later, and how doors, windows, and other openings will be sealed. If you’re remodeling, use the work you already have planned as a chance to inspect areas that are normally hidden.
You don’t have to figure out every product on your own. Bring your plans, measurements, or questions to Alamosa Building Supply or La Jara Trading Post. Our team can help you explore the materials available for your project and think through the details before construction moves ahead.
Building for lower heating costs takes a series of good decisions, from the direction the building faces to its insulation, windows, and heating system. Start planning now, and don’t miss 10% off Knauf insulation from October 1–31, 2026 at Alamosa Building Supply and La Jara Trading Post.
