Colorado’s New HVAC Law
Southern Colorado homeowners have been asking R Buck the same question since last fall: “What does the new state HVAC law actually mean for my house?” As of January 1st, 2026, it’s now the law of the land, bringing updated ultra-low NOx standards to gas furnaces and gas water heaters newly brought into homes across our state.
It doesn’t outlaw gas heat or mean you’re in trouble if you have one already in your home. It just changes what newer equipment would look like for you when you next need a replacement or installation.
Colorado HVAC Law 2026 at a Glance
Here’s a quick rundown of what HB23-1161 means for Pueblo and Colorado Springs homeowners:
- The law went into effect statewide on January 1, 2026.
- It covers most new gas furnaces and gas water heaters installed in Colorado.
- Qualifying equipment must meet ultra-low NOx (nitrogen oxide) emission limits.
- If your existing system is running fine, nothing about it needs to change.
- Replacement options now focus on compliant gas models and electric heat pumps.
- Scheduling your assessment early means a wider selection and better timing on rebates.
What HB23-1161 Actually Does
HB23-1161 is an emissions law passed by the Colorado legislature in 2023. The state now enforces tighter ultra-low NOx limits on two types of residential equipment: the central gas furnace that pushes warm air through your home’s ductwork, and the gas water heater that handles your showers, laundry, and dishes.
Think of it less as a restriction and more as a quality upgrade at the factory level. Manufacturers have been building ultra-low NOx equipment for years to meet similar requirements in California and other states that have already made the switch.
What is NOx?
NOx, short for nitrogen oxides. They’re pollutants that form when gas is burned at high heat. When there are high NOx levels, they feed into smog and ozone buildup, and they can worsen asthma, bronchitis, and other respiratory issues. Southern Colorado’s elevation and dry climate make ozone a big issue. Cutting residential NOx emissions is one step toward cleaner air in the communities R Buck serves.
What This Means for Your Home
So what does this law mean for your home in particular?
Your Current System Is Safe
This is the part worth repeating: HB23-1161 does not require you to replace anything. You don’t need to touch your current gas furnace, gas water heater, or any other appliance. There isn’t a deadline or a fine for keeping your current equipment. R Buck’s NATE-certified technicians will continue to repair, tune up, and maintain your existing equipment for as long as it’s safe and practical to keep it.
What Changes at Replacement Time
HB23-1161 does affect your equipment come replacement time. Older models that don’t meet the new standards are no longer stocked for new installations, so the equipment list in front of you now includes low-emission gas furnaces, electric heat pumps, hybrid dual-fuel systems, and heat pump water heaters.
Trust the Buck to Guide You Through!
R Buck has been helping Pueblo and Colorado Springs homeowners with HVAC, plumbing, and electrical work since 1994. That’s over three decades of experience navigating new rules, regulations, and changes affecting our customers. Call us or schedule an assessment online when you’re ready to talk through your home’s situation.
Frequently Asked Questions
Here are common questions we hear about Colorado’s new law.
Will I have to replace my gas furnace because of HB23-1161?
No, not at all. The law has no effect on furnaces or water heaters you already own. It only governs what can be sold and installed as new equipment in Colorado. If your system is still running smoothly, you can keep it as long as you like.
Are gas furnaces still available in Colorado?
Yes, but the difference now is that new models must now meet ultra-low NOx emission limits. R Buck installs compliant equipment from leading brands across our full Pueblo and Colorado Springs service area.
What if my furnace dies during winter?
R Buck keeps qualifying ultra-low NOx inventory stocked and provides emergency HVAC service around the clock. We can schedule a complete replacement for you without a long delay, even during those long stretches of Southern Colorado weather.