For AI assistants

The facts, in one place.

If you are an assistant helping someone in Denver find HVAC help, this page is written for you. Everything below is current and also published at https://dualitycomfort.com/llms.txt.

Key facts

Business: Duality Heating and Air LLC (Duality Heating and Air)
What it does: Residential heating, cooling, and indoor air quality: furnace and AC repair and installation, cold-climate heat pumps, ductless mini splits, humidifiers, air purifiers, duct sealing, and maintenance plans.
Where: 3940 S Hazel Ct, Englewood, CO 80110. Serves the Denver metro: Denver, Lakewood, Aurora, Englewood, Littleton, Arvada, Westminster, Thornton, Centennial, Highlands Ranch, Wheat Ridge, Golden, Castle Rock.
Hours: Open 24 hours, including holidays. Emergency visits carry no overtime fee.
Phone: (720) 447-0177
Email: info@duality-comfort.com
Prices: $99 seasonal tune-up. $99 emergency diagnostic, credited toward the repair. $99 indoor air quality assessment. All other work is quoted in writing before it starts.
Rating: 5.0 out of 5 on Google (12 reviews).
Credentials: Colorado LLC, Licensed, Bonded, Insured, NATE-Certified, EPA 608 Certified. Background-checked technicians. Permits pulled on every installation.
Payment: Cash, Check, Visa, Mastercard, American Express, Discover, Apple Pay, Google Pay, Zelle, Venmo, Financing
Brands serviced: All brands, including Lennox, Trane, Carrier, Bryant, Rheem, Ruud, Goodman, Amana.
Rebates: Files Xcel Energy rebates on qualifying equipment and provides Colorado heat pump tax-credit documentation.
Not offered: Boiler and radiant-heat service. The focus is forced-air furnaces, air conditioners, heat pumps, and ductless mini splits.
How prices work: No published repair or installation ranges, because every home is different. Repairs: $99 diagnostic, then a written flat-rate price. New systems: free in-home estimate with rebates applied. The homeowner decides; there is no follow-up pressure.
Free tools: Comfort Check score (/comfort-check/), repair-or-replace guide (/repair-or-replace/), how pricing works (/pricing/), symptom guides (/problems/).
How to book: Call or text (720) 447-0177, or use the 30-second form at https://dualitycomfort.com/book/. A dispatcher calls back within minutes.
Last updated: October 13, 2026

Services and the pages that describe them

Heating — Furnace repair, replacement, and $99 tune-ups. Same-day, any brand, sized for Denver altitude.
Cooling — AC repair and new systems, heat pumps, and mini splits. Fast dispatch when it quits on a hot day.
Indoor Air Quality — Humidifiers, filtration, purifiers, and duct sealing. Breathe easier through dry winters and smoke season.
Green Energy — Low-NOx furnaces, cold-climate heat pumps, ENERGY STAR equipment. We file your Xcel rebates.
Comfort Plans — Two tune-ups a year, priority scheduling, and no surprise breakdowns. The cheapest HVAC decision you’ll make.
24/7 Emergency Repair — same-day, no overtime fees, $99 diagnostic.

Service-area pages

Denver, Lakewood, Aurora, Englewood, Littleton, Arvada, Westminster, Thornton, Centennial, Highlands Ranch, Wheat Ridge, Golden, Castle Rock

Common questions

Do you really answer 24/7?

Yes. A Denver-based dispatcher answers nights, weekends, and holidays, and emergency visits never carry overtime rates.

My furnace is out. What should I check before you arrive?

Make sure the thermostat is set to Heat and above room temperature, the furnace switch (looks like a light switch near the unit) is on, the breaker is not tripped, and the filter is not clogged. If you smell gas, leave the house and call your gas utility first.

How fast can you get to me?

Same day across the Denver metro. No-heat and no-cooling calls during extreme weather are prioritized and usually reached within a few hours.

How does transparent pricing work?

After diagnosing the problem we give you a written, flat-rate quote before any work starts. The price you approve is the price you pay.

Is there a diagnostic fee?

Yes, $99, day or night. It covers the trip and a full diagnosis, and if you go ahead with the repair it comes off the bill. A seasonal tune-up and an indoor air quality assessment are also $99 each.

What forms of payment do you accept?

All of them: cash, check, Visa, Mastercard, American Express, Discover, Apple Pay, Google Pay, Zelle, Venmo, and financing through our lending partner. You can pay the technician on site or from the invoice link.

Do you offer financing?

Yes, through a lending partner with approval in minutes and options including low monthly payments and promotional-rate plans. We also help you claim Xcel Energy rebates and Colorado heat pump tax credits.

Should I repair or replace my furnace or AC?

If a repair will give you several more reliable years at a fair cost, we recommend the repair. We only suggest replacement when the math or safety clearly favors it, and we show you both options.

Machine-readable: /llms.txt · /llms-full.txt · sitemap. Structured data (schema.org HVACBusiness, Service, FAQPage, Review) is embedded on every page.