Air Conditioning

In 1993, only 68 percent of homes in the United States had air conditioning. By 2017 that number had jumped to 90 percent. Today, an air conditioner is a standard appliance in Montana and as essential to most families as a car, a microwave, or a refrigerator.

Air conditioning units have made incredible leaps in technology and efficiency in the last few years, making installing and operating a Missoula home or small office air conditioning unit incredibly affordable.

In 2010, the most common refrigerant used in small air conditioning units, R-22, was banned in the European Union (EU) and the United States as part of a phaseout of ozone-depleting chemicals. In preparation for the ban, the heating, ventilation, and air conditioning (HVAC) industry moved toward R-410A as the replacement for R-22.

The adoption of R-410A in home and small office air conditioners began a new era in high-efficiency air conditioning systems. Air conditioning units are more efficient, have a smaller footprint, and quieter than ever before.

Design Air has been replacing older R-22 units with new R-410A equipment for years. Call our team at 406-251-7997 and we will help you find the right unit for your home. Request air conditioning service online today.

Ductless Systems

The era of ultra-high efficiency heating, ventilation, and air conditioning (HVAC) units is here. Ductless systems are small, wall-mounted, single-zone heating and air units with cooling Seasonal Energy Efficiency Ratio (SEER) ratings near 30 compared to standard units with a typical SEER around 18. It is not uncommon in Montana for homeowners to see substantial savings in their energy bills the first month after installation of a mini split system.

Mini split units solve multiple problems at once. High efficiency makes a ductless system an outstanding replacement for an older HVAC unit. The ability to connect multiple ductless units to one condensing unit creates a zone control system, bringing high efficiency to multiple rooms. These systems offer extra benefits for your Missoula home and can save you money overall.

Is your home right for a new ductless system? One call to Design Air at 406-251-7997 and we can survey your home to see which ductless system will serve you best. Request ductless system service online today.


The last 10 years have seen incredible advancements in home-heating technology. The standard efficiency home furnace installed in most houses in Montana is becoming obsolete. In its place is an impressive lineup of gas furnaces that do everything from make instant hot water, warm radiant floors, and feed radiator systems.

This new supply of gas heater is more compact and more efficient than ever. In addition to our fast furnace repair, replacing an older gas furnace with a new, 95 percent efficient condensing furnace is one of Design Air’s most common heating equipment calls.

A condensing furnace achieves high efficiency by using the hot combustion gasses, or flue gas, to add an additional stage of heating to the water. Extracting more heat from the flue gas causes the gas to condense in the furnace, creating cooler flue gases that can be vented with PVC pipe instead of expensive double wall flue pipes. Missoula homeowners realize immediate savings on their gas bills with a condensing furnace.

If you have an old electric furnace, call 406-251-7997 . We can work together to install a new high-efficiency furnace. Request furnace service online today.

Gas Fireplaces

Gas fireplaces have come a long way in the past couple decades. There are many options available with something for every taste. A gas fireplace could be a great option for you if you are looking for that type of ambience in your Missoula home.

These fireplaces are easy for our professionals to install and look amazing. The newest models are much different than the models of even five years ago. When you add a wide variety of styles, the easy on and off switch, and the sheer coziness of a fireplace to your Montana home, a residential gas fireplace becomes a much more appealing option.

It is worth noting that while these may seem easy to install and a tempting do-it-yourself (DIY) project, these fireplaces need to connect to a gas line. Anytime you are working with gas, you can’t take chances—installing a gas fireplace is best left to the professionals.

Considering a gas fireplace for your home? Our Design Air professionals are ready and willing to help—call today at 406-251-7997. Request gas fireplace service online today.

Heat Pumps

The most common service we at Design Air provide to our customers in Montana is the repair and maintenance of residential and light commercial heat pumps. We are known throughout the Missoula area as the company to call when customers need heat pump and mini split heat pump maintenance. In addition to making quick and affordable repairs, we provide residential and light commercial maintenance maintenance agreement plans and full unit replacements.

There is a dizzying array of choices when it comes to replacing and installing heat pump systems. What manufacturer is best? Should you buy a high-efficiency or standard-efficiency heat pump? What about all the different kinds of thermostats?

Homeowners should not make these decisions on their own. We love to help our customers make informed choices regarding their new uni—choices that fit their needs and their budgets.

Call us at 406-251-7997 to set up an appointment at a convenient time and walk you through all the choices. Request heat pump service online today.

Indoor Air Quality

Do you find yourself feeling tired all the time? Are you suffering from allergies, asthma, or constant respiratory distress? Although these things can originate from many different sources, poor indoor air quality is a possibility.

Our team at Design Air here in Missoula wants to help you ensure a healthy home. We will come out and test the air quality in your Montana home. If they find any issues, they can provide remediation services to help you improve it.

Everyone has dust and dust mites in their home as well as some level of chemicals released from carpeting, cleaning supplies, and other household substances. In addition, if you have pets, you will generate more hair and dander. Smoking also adds particulates to the air. All of these things can contribute to an indoor air quality problem.

Testing of indoor air quality is something we do every day. If we find issues, our experienced professionals might recommend remediation such as air duct cleaning or replacing your air filters in your heating, ventilation, and air conditioning (HVAC) system. A wide variety of air filtration and air purification systems are available on the market today as well, which can help improve your indoor air quality.

Call our team at Design Air today. We can be reached at 406-251-7997 to provide information or answer questions. Request indoor air quality service online today.


Everything has its season, and your heating, ventilation, and air conditioning (HVAC) system is no different. Your furnace puts in overtime during the chilly winters while taking a rest in the summer, and your air conditioning unit works on the opposite schedule in Montana. Our team at Design Air recommends that right before your furnace or air conditioner goes into high gear you schedule an HVAC maintenance service call.

Our trained professionals will conduct a complete inspection and cleaning of your HVAC system. Talk with us about our multipoint inspection. It includes a filter change, lubrication, pressure and safety check, and much more. You will also have a trained eye on your system so any potential problems can be caught quickly and repaired before your HVAC system stops working.

In the long run, investing in HVAC maintenance can save you a great deal of stress and money in your Missoula home. A well-maintained system will not only function better, but it will consume less energy every day. In addition, it can help increase the working life of your whole system, making it less likely you will have to invest in a new furnace or air conditioning unit prematurely.

When you are ready to schedule your HVAC maintenance visit, contact Design Air at 406-251-7997 . We would be happy to answer questions or share more details. Request HVAC maintenance service online today.

Gas Furnace Replacement in Missoula, MT 59808

“Tristan and Cody did an excellent job replacing my old furnace with a new one. They were very professional and knowledgeable in answering my questions about the new furnace.”

– Lee W.

Gas Furnace Installation in Missoula, MT 59803

“Tristan and Cody were exemplary. They were courteous, professional, answered our questions, and worked until the job was finished. They were very efficient and I’d highly recommend them and Design Air for any heating/cooling issues. Excellent service all around.”

– Melinda L.

Air Conditioner Installation in Missoula, MT 59804

“Super happy with our new A/C system. Tristan and Cody showed up right on time, were friendly and respectful, and worked their tails off to install a complex system very quickly. Very happy with their work and the new system. Will recommend Design Air to others!!”

– Dan M.

'- Dan M.

Air Conditioner Installation in Missoula, MT 59801

“The Design Air crew came out to set up central air in our house during the middle of COVID-19 and it was a wonderful experience. They were respectful of our space, efficient, and thorough. This is my first time having central air in my house and the technicians were great about explaining what they were doing and why, showing me how to program the thermostat, etc. I highly recommend this business.”

– Melanie S.

'- Melanie S.

Gas Furnace Installation in Missoula, MT 59802

“Design Air provided very professional service. The installation technician Tristan was polite and informative.
I would recommend this company for your HVAC needs.”

– Mike G.

'- Mike G.

Gas Furnace Replacement in Missoula, MT 59801

“job done in one day very efficiently, thank-you!”

– robert s.

'- robert s.

Gas Furnace Installation in Missoula, MT 59803

“They were professional and quick about getting my replacement furnace out. Tristan took his time to be sure that everything was installed properly and that we understood what changed and how it all worked. He was polite and professional. Thank you!”

– Kristina W.

'- Kristina W.

Installation in Missoula, MT 59801

“Tristan, Cody, and Mike were excellent! Seriously love you all and appreciate your excellent service, prompt help, and going to extra mile. We’ve loved all that you’ve done for us!”

– Meradeth S.

'- Meradeth S.

Gas Furnace Replacement in Missoula, MT 59802

“The 30 year old furnace at my folks place finally failed and I desperately needed it to be evaluated. I have to drive a long way to get to my folks place and the Design Air team was very accommodating to timeline/schedule. After a thorough review the tech showed me multiple concerns with the old furnace and very clearly explained why the furnace was failing. He gave me multiple options to choose from, and I decided to replace the system. A week later I met the replacement team at my folks place again and I just cannot tell you how impressed I was by the courtesy and professionalism of the team. They lined the entire floor-route from the front door to the furnace with canvas and plastic to ensure they didn’t impact the floor. They were quiet and fast and had the entire old system removed and they new system up and running by just shortly after lunch. What really impressed my was how they kept me informed of their progress throughout the morning; which was unexpected and really comforting. When they left the new furnace was working great and they gave me a great overview of what they did and how the new system would function. AND, when they were finished THE ENTIRE FURNACE ROOM WAS CLEANER THAN WHEN THEY ARRIVED… really impressive effort to go above and beyond my expectations. The team was wonderful and I just can’t say enough about the service and quality.

With respect and tremendous thanks to Griffin, Cody and Tristen.


– Devin H.

'- Devin H.

Gas Furnace Replacement in Missoula, MT 59803

“Tristan was extremely professional and did an amazing job. He and his coworkers stayed late to finish the job because my house had a few obstacles and they made sure everything was done right. Tristan also took the time to explain everything to me at the end so I know how to operate my new furnace which I really appreciated! Highly recommend!”

– Bailey H.

'- Bailey H.