By combining immediate results with sustainable performance, we protect the value of your investment.  We provide skilled installation, maintenance, and repair of gas furnaces, heat pumps, dual fuel systems, boilers, air conditioners, air quality products, traditional and tankless water heaters, and advanced duct cleaning services.  Welzig Heating & Air is the right choice for  the comfort, safety, and health of homes or offices across Boulder, Longmont, Louisville, Lafayette, CO & more.
When you hire Steel T Heating & Air Conditioning, know that you’re hiring a business that is fully licensed and insured with certified technicians that receive ongoing training. In order to earn the status of a Carrier Factory Authorized Dealer, our company is held to strict standards for customer satisfaction, product knowledge, technical expertise, and business practices. For five years in a row, we were honored to be selected as a Carrier President’s Award winner. This award identifies Steel T Heating & Air Conditioning as an example of excellence for dealers across the nation to follow. We’re also the only heating and cooling company in the state of Colorado to be inducted into the Carrier Hall of Fame, a distinction that only 25 other dealers in the country can claim. We are extremely proud of the superior service and quality products we offer to homeowners in Littleton, Lakewood, Centennial, Highlands Ranch & Englewood, CO. We never rest on past achievements, but continue to find new ways of earning your business.

Have you experienced a summer without an air conditioning unit? Have you ever tried to get through the long, hot months of June, July and August with a faulty central air conditioning unit? A fully functioning A/C unit is a necessity, particularly when the mercury starts to rise. We provide replacement and installation of old and inefficient central, air conditioning units, giving you the peace of mind that comes with a reliable new air conditioning system. Instead of continuing expensive repairs on an old system and the stress of never knowing when your system might stop working again, consider installing a new air conditioning system from Sears Home Services.
Appointment was scheduled between 8am and 11 am, technician called and said that he will at 11 am, technician arrived at 11:23am. The request for service was regarding Furnace Maintenance, more specifically fan won't stop turning after heater has stopped after reaching desired temperature. Service was provide by Sam Singh from WesternAir Mechanical Heating & Air Conditioning. The mechanic opened the side panels of the heater+ac unit and concluded that the unit is too old for maintenance, as in it is not worth it, even though I have already payed $94.19 through Amazon.com. The mechanic spend close to one hour explaining how my heater+ac unit is too old for any updates and that it should just be replaced. I didn't receive any of the services that are included in the Furnace Maintenance package listed on Amazon.com. https://www.amazon.com/gp/product/B015JRGSQI/ref=od_aui_detailpages00?ie=UTF8&psc=1 I was ripped off my this company and I would very much like my money to be returned to me. Opening and closing the panels of my unit doesn't cost more than $2, I can do that by myself.
There is no denying the popularity of furnaces as a heating system option. There is a reason that gas furnaces are so ubiquitous. In fact, there are several. Natural gas furnaces in Seattle, WA are prevalent because they are efficient, reliable, and effective. Schedule your gas furnace installation, repair and maintenance with a member of our team.

As Idaho’s HVAC comfort and zoning specialists, Ultimate Heating & Air handles all of your residential heating, cooling, and air quality requirements.  For every project, we target energy efficiency and reliability of your essential equipment, trimming cost of operation and ownership, while optimizing comfort.  Through industry-leading innovations in both products and strategies, we simplify the challenges of everyday life, put you in superior control over your indoor environment, and promote sustainable solutions.


Of the various contractors and HVAC service companies, why should you choose AQS for air conditioning and furnace repair? Our company is a family-owned and operated business that has been in business since 1996. It goes without saying that we are extremely experienced in the installation and repair of heating and cooling units. We are proud of our A+ rating from the BBB, and we have received numerous Super Service Awards from Angie's List, both in recognition of the quality services we provide.
Furnaces and thermostats are not mix-and-match appliances. Using the wrong type of thermostat with a furnace will cause operating problems and can be dangerous. Although thermostats look similar, they are designed very differently. There are numerous types of heating systems and thermostat systems and they need to be coordinated for safe and proper operation. There are three types of thermostat systems used today: millivoltage, low voltage, and line voltage.​
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