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Duality Heating and Air

Cooling

Cool, quiet, and ready for the next 100-degree week.

Repair and replacement for AC, heat pumps, and mini splits, built for Denver’s dry, high-altitude summers. Fast dispatch when it quits on the hottest day. Honest advice when it’s time to upgrade.

  • $99 ac diagnostic
  • Same-day across Denver
  • Written price first
Get Help Fast (720) 447-0177

Good to know

  • Sized by the numbersAltitude and dry air change the math. A heat-load calculation and a Manual J on every home, not a rule of thumb.
  • Heat pumps that work hereCold-climate models heat below zero and qualify for Xcel rebates.
  • Same price at 2 a.m.Nights, weekends, and holidays never carry an overtime fee.

$99 AC diagnostic. Credited toward the repair.

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.

  • Denver-based

    One technician who lives here, not a call center in another state.

  • Price in writing

    You approve the number before we touch a tool. It never changes.

  • Fix before replace

    We repair what can be repaired and show you both numbers when it can’t.

Common problems we fix

Sound familiar?

  • Blowing warm air

    Low refrigerant, a failed capacitor, or a frozen coil. We find the actual cause instead of just topping it off.

  • Outdoor unit won’t start

    Capacitors and contactors fail in the heat. A fast, cheap fix when it’s caught early.

  • Ice on the lines

    An airflow or refrigerant problem. Turn the system off so the coil can thaw, then call us.

  • Water around the furnace

    A clogged drain or cracked pan. Fix it before it reaches the drywall.

  • Runs all day, never cools

    Undersized, leaky ducts, or a system that has lost capacity. We measure instead of guessing.

  • Buzzing or grinding

    A failing fan motor or compressor. Shut it down and call to avoid a bigger bill.

Get Help Fast

$99 AC diagnostic. Credited toward the repair.

What’s included

Everything under cooling.

Written flat-rate quote before any work. If a repair doesn’t make sense, we say so, and the $99 diagnostic is credited toward a new system.

How pricing works Financing and rebates
  • Air conditioner repair on every brand
  • New central AC and cold-climate heat pump installation
  • Ductless mini splits for additions and homes without ducts
  • Hail and storm damage checks on outdoor units
  • Refrigerant leak detection and repair
  • Seasonal AC tune-ups and coil cleaning

Good questions

Cooling FAQ.

Do heat pumps work in Denver?

Modern cold-climate heat pumps keep full power to about 5°F and keep running below zero. Paired with your furnace as a dual-fuel system, they cut summer and shoulder-season bills without giving up the furnace on the coldest nights.

How long does an AC installation take?

Most replacements are done in one day. We pull the permit, handle the inspection, and register your warranty.

AC or heat pump for a Denver home?

A cold-climate heat pump cools exactly like an AC and also heats most of the winter on cheap electricity, with bigger rebates. We show both numbers side by side and let you choose.

All homeowner questions

Related problems

Real Denver neighbors

  • 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.”

  • 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.”

  • Jake Henriksson

    Google review
    “Punctual, communicative, and extremely professional without being a corporate robot. He tells the truth and gets things done. And he’s a one-man team, so things aren’t going to get lost in translation. 100% recommend.”

What to expect

Your visit, step by step.

  1. 01

    You send the form

    A few taps, or call or text. About 30 seconds.

  2. 02

    We call you back

    A Denver dispatcher confirms the address and window.

  3. 03

    Price in writing

    Flat-rate, before any work. You say yes or no.

  4. 04

    The fix

    Most repairs finish on the first visit. Parts on the truck.

Ready When You Are

Tell Us What's Wrong. We'll Call You 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.

Request service

Step 1 of 4 About 30 seconds
What do you need?
Step 2 · What’s going on?

Step 4 · Who should we call?

A real person calls you back, usually within minutes. 24/7.

Private and secure. We may call or text this number about your request. Reply STOP to opt out.

Two taps and a phone number. Or just call (720) 447-0177.

Where we do this

More services

(720) 447-0177Call now. We answer 24/7. Book a Service