Furnace Installation in Denver, CO
New furnace installation — typical range $5,400–$7,500 installed. All major brands, permit handled, old unit removed.
A new furnace installation in Denver is one of the most important investments you can make in your home. Denver's altitude (5,280 ft) affects combustion efficiency — all gas furnaces must be properly altitude-adjusted during installation to operate safely and efficiently. Our NATE certified installers are trained on Denver-specific installation requirements.
New furnace installation in Denver typically runs $5,400–$7,500 fully installed depending on furnace size (BTU), efficiency rating (AFUE), brand, and home configuration. Full furnace plus AC replacement projects often fall in the $10,000–$19,000 range. All installations include permit filing, proper load calculation (Manual J), altitude adjustment, startup and combustion testing, and removal of the old unit.
Colorado HB23-1161: What Denver Homeowners Need to Know
As of January 1, 2026, Colorado law (HB23-1161) requires all new gas furnaces sold in Colorado to meet ultra-low NOx emissions standards — a reduction of roughly 85% from previous standard furnace emissions limits. NOx (nitrogen oxide) is a smog-forming pollutant, and Colorado's Front Range has ongoing air quality challenges that drove this legislation.
What this means practically for Denver homeowners: standard 80% AFUE furnaces can no longer be manufactured for sale in Colorado after December 31, 2025. The two main compliance pathways for new installations are Energy Star certified furnaces (96%+ AFUE and currently listed on the EPA's Energy Star database) or ultra-low NOx certified models. For most Denver homes, the Energy Star path — a 96%+ AFUE high-efficiency furnace — is the most practical and widely available compliant option.
What HB23-1161 does NOT do: it does not ban natural gas in your home. It does not require you to replace an existing, working furnace. Repairs to existing gas furnaces are still fully permitted. The law applies only to new equipment sold and installed after the effective date.
Denver sits at 5,280 feet — well below the 7,500-foot elevation threshold where some ultra-low NOx furnace models have documented performance limitations, so Denver homeowners are not affected by the altitude restriction that applies to mountain communities above 7,500 feet.
The practical impact: most new furnace installations in Denver will now be 96%+ AFUE high-efficiency systems. While this means a higher upfront cost compared to the old 80% AFUE standard, it also means lower monthly gas bills — a 96% AFUE furnace uses roughly 18% less gas than an 80% AFUE unit, paying back the efficiency premium within 5–8 years on a typical Denver gas bill.
Brands We Service
Furnace Installation in Denver and the Front Range
We provide furnace installation across Denver and nearby Front Range communities including Aurora, Lakewood, Littleton, Centennial, Englewood, Westminster, Arvada, Thornton, Broomfield, Parker, and Highlands Ranch. Our dispatch model is built for metro coverage, with technicians routed by proximity so we can offer same-day service windows for most calls and rapid emergency response when safety or comfort is at risk.
Colorado homes face a unique HVAC mix: high-altitude combustion requirements, dramatic shoulder-season temperature swings, hail-season equipment wear, and dry-air airflow challenges that affect filter loading and system efficiency. Our team accounts for these Denver-specific factors during diagnosis and recommendations, so repairs and installations are matched to local operating conditions, not generic out-of-state assumptions.
If you are comparing contractors for furnace installation, ask for licensing, insurance, certification, and written scope details before approving work. We provide all of that up front, including clear pricing, realistic timelines, and practical options based on equipment age, operating costs, and long-term reliability for Denver-area homes and businesses.
Why Denver Homeowners Choose Us
10+ years serving the Denver metro. Here is what sets us apart from other HVAC companies.
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4.3 Stars — 84+ Google Reviews
Real reviews from Denver homeowners and businesses. We earn every one.
"I booked them for a full HVAC system checkup before winter. They inspected heating and cooling units thoroughly. A few small issues were fixed on the spot. Very reliable and skilled team."
"Our air conditioning stopped working in the middle of summer. They responded fast and provided excellent HVAC repair service. The technician was professional and very knowledgeable. Our home is cool and comfortable again."
"Great service and communication! Our furnace went out during a cold spell and they were able to get us back up and running within a day. The team was easy to work with and explained everything well. Alfredo, Merrill and Lisa went above and beyond to take care of us! Highly recommend!"
"My AC quit working on a 90 degree day. I called Denver's Best and they were able to fit me in for a same day appointment. I was so thankful to get my AC repaired the same day — especially with my 3 kids home for summer vacation. AJ was very knowledgeable and professional! I will be calling this company for any future AC or heating repairs."
"We give Denver's Best HVAC five stars. Very fair pricing on our water heater, furnace replacement, and AC install. Merrill, the install tech, was very knowledgeable. He identified duct work issues improving air flow throughout the house, and installed a REME-HALO air purification system. Our air is now very clean. You REALLY ARE Denver's Best HVAC."
"The service on my AC and furnace install was wonderful. The office staff was very responsive and professional. Zachary, my technician, was very thorough and knowledgeable. He kept me informed and also advised me on getting regular maintenance. I would highly recommend this company."
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