While Colorado’s air is about to get a little cleaner, for many homeowners, a new law coming in 2026 has raised more questions than answers. If you’ve heard rumors about gas furnace bans, mandatory replacements, or rising costs, you’re not alone.
At Absolute, we’re here to cut through the confusion and give you the clear, practical info you need to plan ahead. Let’s break down what House Bill 23-1161 actually says, and what it doesn’t.
What the Law Is
Starting January 1, 2026, Colorado House Bill 23-1161 requires that all new gas-fired central furnaces and gas water heaters meet ultra-low NOₓ (nitrogen oxide) emission standards.
That means:
- If you buy a new gas furnace or water heater after 1/1/26, it must be a low-NOₓ model.
- The law does not apply to existing systems or repairs.
- The goal is to reduce harmful emissions and improve air quality statewide.
What Equipment Does the Law Apply To?
The mandate specifically targets:
- Gas-fired central furnaces (fan-type models)
- Gas water heaters (residential and commercial units under 2,000,000 Btu/hr)
Important: This law only affects new sales or leases. If your furnace or water heater is working fine, you don’t have to replace it.
Why This Law Exists
Nitrogen oxides (NOₓ) are pollutants produced by gas combustion. They contribute to smog, ozone issues, and respiratory problems, especially in high-altitude regions like Colorado.
HB23-1161 is part of a broader push to clean up Colorado’s air, reduce fossil fuel emissions, and transition to healthier, more sustainable living.
Who the Law Is Really For
While homeowners are the end users, HB23-1161 is aimed at:
- Manufacturers
- Distributors
- Retailers
- HVAC contractors
These groups will be responsible for complying with the new low-NOₓ standards on any new units sold or installed after the deadline. For homeowners, the main impact will be changes in the available models, installation options, and possibly pricing.
What The Law Means for You as a Homeowner
If your furnace or water heater is getting older (10+ years), this is a smart time to plan your next steps.
- You don’t need to panic or replace your system immediately.
- You can still repair or maintain your current system.
- After 1/1/26, your replacement options will shift. Some older, more affordable models may be phased out.
- Prices may go up slightly for compliant equipment due to manufacturing changes.
- Inventory may be limited in late 2025 as homeowners rush to schedule replacements.
At Absolute, we recommend scheduling a system checkup now if your equipment is aging, so you can make an informed decision on your timeline.
Furnace Mandate FAQ
Q: Is this a gas ban?
A: No. Gas systems are still allowed, just with cleaner emissions.
Q: Do I have to replace my furnace or water heater before January 2026?
A: No. This only applies to new purchases or leases. If your current system works, you can keep it.
Q: Will I still be able to buy a gas furnace or water heater?
A: Yes, but only models that meet the new low-NOₓ standards.
Plan Ahead with Absolute
Whether your system is near the end of its lifespan or you just want to know your options, Absolute is here to help you navigate the new rules.
Our certified HVAC technicians can:
- Inspect and assess your current furnace or water heater
- Walk you through compliant upgrade options
- Help you lock in current pricing before potential increases
- Offer financing (including 0% APR for 60 months on select systems)
- Secure up to $1,200 off full system installs
Call (720) 807-5715 or schedule a service online to get started.