Common problem · This week
Gas bill keeps climbing?
Denver gas rates rose, but a jump bigger than your neighbors’ usually points at the furnace or the ducts. Here’s what we check.
- $99 diagnostic, credited to the repair
- Same-day across Denver
- No overtime fees
How urgent
Book a $99 tune-up. We’ll tell you exactly where the money is going.
- Call if: Therms are up 20% or more with no change in weather
- Call if: The furnace is over 15 years old
- Call if: Rooms far from the furnace never warm up
What it usually is
The causes, most common first.
- 1
Old 80% furnace
A fifth of every dollar goes up the flue. A modern furnace, up to 99% efficient, keeps far more of it in the house.
Replacement, with Xcel rebates applied
- 2
Leaky ducts
Heated air dumps into the attic or crawlspace instead of the rooms.
Duct sealing
- 3
Dirty burners or wrong gas pressure
The furnace burns rich and wastes gas. A tune-up fixes it.
The $99 tune-up
- 4
Thermostat schedule
Heating an empty house all day. A schedule, or a smart thermostat that learns one, fixes it.
A smart thermostat, often rebated
Every fix gets a written price before any work. The $99 diagnostic is credited toward it.
Try this first
What to check before you call.
If one of these fixes it, great. If not, you’ve saved us five minutes on the diagnosis.
- 1
Compare this year’s therms to last year’s on the Xcel bill, not just dollars.
- 2
Feel for warm air leaking at duct joints in the basement.
- 3
Set a schedule on the thermostat.
Who we are
Hello. We’re Duality.
Duality Heating and Air LLC is a Denver heating and cooling company run by one licensed technician and the people he trusts. We fix furnaces, ACs, heat pumps, and the air in your home, and we do it the way we’d want it done at our own house. Comfort, in perfect balance.
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Denver-based
One technician who lives here, not a call center in another state.
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Price in writing
You approve the number before we touch a tool. It never changes.
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Fix before replace
We repair what can be repaired and show you both numbers when it can’t.
Questions
High Gas Bill, answered.
Will a new furnace really lower my bill?
Going from an old 80% furnace to a modern one that’s up to 99% efficient means far less gas goes up the flue. We put the real number, using your own bills, on the written estimate.
From Denver neighbors
- HVAC service
Cecilia Gomez
Google review“Professional, knowledgeable, and incredibly helpful. He took the time to explain everything clearly, answered all of my questions, and made the entire process easy and stress-free. I truly appreciated his honesty, responsiveness, and attention to detail.”
- AC repair
Jessica Russman
Google review“Very honest and reliable. He showed up on time and fixed our old AC after we had several companies try to sell us a new one. We would 1000% recommend Duality to anyone who wants to feel confident they’re dealing with the right company.”
Free estimate
Gas bill keeps climbing? Tell us. We’ll call back in minutes.
Three quick taps. A real Denver dispatcher calls to confirm your address and get a truck moving. No call center, no waiting on hold.
- Written flat-rate price before any work starts
- Same-day service across the Denver metro
- No overtime fees, nights and weekends included
Prefer to talk? (720) 447-0177, open 24 hours.
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