New furnace installation and replacement. Energy-efficient systems with financing options. NATE Certified technicians Licensed in 8 Colorado jurisdictions.
When it's time for a new furnace, choosing the right system and installer makes all the difference. On Time Heat & Air provides expert furnace installation with proper sizing calculations for Colorado's altitude and climate. We install high-efficiency gas furnaces (up to 98% AFUE), electric furnaces, and dual-fuel systems. Our installations include proper combustion testing at altitude, ductwork inspection, and a full system safety check. We help you navigate available rebates and tax credits, and offer flexible financing from $79/month.
Our NATE Certified technicians have the training and real-world experience to handle any furnace installation job. We hold active licenses in 8 Colorado jurisdictions — Adams, Arapahoe, Aurora, Broomfield, Commerce City, Denver, Douglas, and Jefferson — so we're authorized to work anywhere in the Denver metro. We provide upfront pricing, honest recommendations, and stand behind every job.
Select your city for location-specific furnace installation information:
Fast diagnosis and repair for all AC brands. Same-day emergency service available 24/7.
Professional central air installation and replacement. Free estimates on all new systems.
Expert furnace repair for all makes and models. 24/7 emergency heating repair available.
Heat pump installation, repair and maintenance. Year-round comfort, energy-efficient.
Annual AC tune-ups and maintenance to extend system life and keep energy bills low.
Free tips and guides from our NATE Certified team:
⚠️ New 2026 Colorado Furnace Regulations Are Here
Learn How New Ultra-Low NOx Requirements Affect Your Furnace →A furnace installed in Denver isn't the same as one installed in Dallas. At 5,000+ feet, the thinner air changes combustion efficiency. Gas pressure, burner orifice sizing, and draft all need altitude-specific calibration. A furnace installed without these adjustments wastes gas and may trip safety limits repeatedly.
We recommend 96% AFUE two-stage furnaces for most Denver Metro homes. They run on low 80% of the time, switching to high only during deep cold snaps. That means lower gas bills, quieter operation, and more consistent temperatures room to room.
Every furnace we install goes through a complete commissioning process: we verify gas pressure at the manifold, measure temperature rise across the heat exchanger, test carbon monoxide levels at the supply registers, and confirm the flue is drafting properly. We don't leave until the system passes every check.
See our furnace installation cost guide for detailed pricing by efficiency rating.
Common questions from Denver Metro homeowners.
A new furnace installation in the Denver Metro runs $2,500 to $8,000 depending on efficiency rating and home size. A standard 96% AFUE two-stage furnace for an average home costs about $4,500–$5,500 installed. Higher-efficiency modulating furnaces run $5,500–$8,000.
For most Colorado homes, a 96% AFUE two-stage furnace is the sweet spot. It captures 96 cents of every dollar spent on gas. The upgrade from 80% to 96% typically pays for itself in 4–6 years through lower gas bills.
A standard furnace replacement takes 4–8 hours and is completed in one day. If ductwork modifications or gas line work is needed, it may extend to a full day. We provide an accurate time estimate before starting.
If both systems are over 12 years old, yes. Replacing them together saves on labor costs, ensures matched efficiency ratings, and avoids paying for two separate installation visits. Our combo packages start at $5,500.
Yes. We pull all required permits and schedule the inspection. Every installation meets local code requirements in whichever county you're in — Adams, Arapahoe, Denver, Douglas, Jefferson, Broomfield, Aurora, or Commerce City.
Serving Henderson, CO too — Furnace Installation in Henderson →