Systems up to 24 SEER2
Cooling
Central air repair, replacement and tune-ups. Every new system is sized with a room-by-room load calculation, not a guess from the old unit’s sticker.
Book cooling serviceMake your own weather.
Heating, cooling and clean air for Front Range homes since 1987. Same-day appointments, seven days a week.
Outside in Denver 41°
Inside 72°
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Nobody thinks about their furnace on a good day. That’s the whole idea. We keep January warm, July cool and the air in between clean, so the only weather you notice is outside the window.
“I started with one van, one phone line and one rule: tell people the price before you touch anything. Seventy trucks later, the rule hasn’t moved.” Lena Ortiz, founder
See what we fixEverything that moves air through your house.
Eight kinds of work, from a twenty-minute filter swap to a full heat-pump conversion. Every truck carries the parts for the most common repairs, so most jobs finish on the first visit.
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Furnaces up to 98% AFUE
Heating
Furnace and boiler repair, safety inspections and high-efficiency replacements. Every heating visit includes a carbon monoxide test.
Book heating serviceHeats down to −13°F
Heat pumps
It doesn’t make heat, it moves it: in during winter, out during summer. We size it to your house and file the utility and manufacturer rebates for you.
Get a heat pump quoteAs quiet as 19 dB
Ductless
Mini-splits for additions, attics, garages and older homes without ductwork. Each room gets its own setting.
Plan a ductless installMERV 13 to HEPA
Air quality
Filtration, UV purification, humidifiers and fresh-air ventilation for allergies, pets, wildfire smoke and dry winters.
Book an air checkTypical leaks: 20–30% of airflow
Ductwork
Leak sealing, balancing and new duct design, so the far bedroom gets the same air as the room by the furnace.
Book a duct testUp to four zones per home
Thermostats
Smart thermostat installs and zoning, so upstairs and downstairs can finally stop negotiating.
Upgrade a thermostatRooftop units up to 50 tons
Commercial
Maintenance contracts and fast repair for offices, restaurants and shops. After-hours work so you never close for it.
Talk to commercialSince 1987 we’ve answered 214,380 calls. A person picks up in 22 seconds, a tech reaches no-heat calls in 52 minutes, and 96% of repairs are finished on the first visit.
CarrierTraneLennoxRheemGoodmanDaikinMitsubishiBryant
YorkAmerican StandardAmanaRuudFujitsuBoschNavienWeil-McLain
We repair and install every major make, including the one in your basement that nobody recognizes.
Clear the air.
Drag across the glass
The EPA estimates indoor air can hold two to five times the pollutants of the air outside. Closed-up winter houses, pets, cooking and wildfire smoke all add to it. Most of it is invisible, and almost all of it is fixable.
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Filtration
MERV 13 media cabinets catch fine dust, pollen and smoke particles that a standard 1-inch filter lets through.
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Purification
UV-C lamps inside the air handler keep the coil clean and cut down on mold and bacteria.
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Humidity
Whole-home humidifiers for the dry months that crack lips, hardwood and guitar necks.
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Fresh air
Energy-recovery ventilators bring outside air in without throwing away the heat you paid for.
How a visit works
Four steps, the same every time. You’ll know who’s coming, when they’ll arrive and what it costs before anyone picks up a wrench.
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Work order 0001 Step 1 of 4
Book
Call, text or pick a time online. You get a two-hour arrival window and a text with your tech’s name and photo when they’re on the way.
- Arrival window
- 2 hours
- Same-day slots
- Most weekdays
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Work order 0001 Step 2 of 4
Diagnose
Your tech checks the whole system, not just the symptom, then walks you through what’s wrong in plain English with photos of the parts.
- Diagnostic fee
- $89, waived with repair
- Safety check
- Included
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Work order 0001 Step 3 of 4
Price
You see a flat price for the whole job before work starts, with a good, better and best option when there is one. No hourly meter, no overtime charges.
- Pricing
- Flat, upfront
- Nights and weekends
- Same price
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Work order 0001 Step 4 of 4
Fix
We make the repair, clean up after ourselves and test the system until it holds temperature. Then we put a year’s guarantee on the labor.
- Labor guarantee
- 1 year
- New systems
- 10-year parts and labor
Promises, in writing. Front print, not fine print.
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The price is the price.
You approve a flat price before we start. If the job runs long, that’s on us.
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On time, or it’s free.
We arrive inside your two-hour window or call ahead. Miss it without a heads-up and the diagnostic is free.
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Fixed right, or fixed free.
If the same problem comes back within a year, we fix it again at no charge, parts and labor.
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Nights cost the same as days.
No overtime, weekend or holiday rates. A 2 a.m. Sunday repair is billed like a Tuesday morning.
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Ten years on new systems.
Parts and labor on every system we install, and we register the warranty for you.
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You won’t know we were here.
Boot covers, drop cloths and a wipe-down. The only sign we visited is that it’s comfortable.
Every season has a job.
Spring
- Swap the filter before the first warm week.
- Clear two feet around the outdoor unit: leaves, mulch, toys.
- Book the AC tune-up before the first 85° week fills the schedule.
Summer
- Set 78° when you’re home and higher when you’re out.
- Ice on the copper lines? Switch to fan-only and call. Don’t chip it.
- Heat advisory days fill fast. Book by 2 p.m. for same-day.
Fall
- Furnace safety check before the first freeze, with a CO test.
- Test smoke and carbon monoxide detectors. New batteries.
- Ceiling fans clockwise on low to push warm air down.
Winter
- Keep drifting snow off the heat pump. A little steam during defrost is normal.
- Clear snow from the furnace intake and exhaust pipes outside.
- Heat out? Check the breaker and filter, then call. Nights cost the same.
A tune-up twice a year costs less than one surprise.
Most breakdowns start as something small a tune-up would have caught. Plans cover the visits, move you up the schedule when it’s busy and take money off repairs. Cancel any time.
Tune
$12a month
For newer systems that mostly need a yearly look.
- One tune-up a year, heating or cooling
- Priority scheduling
- 10% off repairs
Most homes pick this
Comfort
$19a month
Both systems looked after, before each season starts.
- Spring AC and fall furnace tune-ups
- Front of the line when it’s busy
- 15% off repairs, no overtime fees
- Filters delivered to your door
Total
$34a month
Repairs on covered equipment included, parts and labor.
- Everything in Comfort
- Covered repairs at no charge
- Yearly air quality check
- 4-hour emergency response
Replacing a system?
Financing from $89 a month with approved credit, or 0% for 18 months with equal payments on qualifying installs. Every system price includes permits, haul-away of the old unit, a new thermostat, start-up testing and warranty registration.
The federal heat pump tax credit ended for systems installed after December 31, 2025. Utility and manufacturer rebates are still out there. We check what your address qualifies for and file the paperwork.
12,640 neighbors have opinions.
4.9 average across Google, Yelp and Nextdoor
“Furnace died the night before Thanksgiving with fourteen people coming. Dispatch picked up at 11:40, and the house was warm before the turkey went in.”
“Two other companies said we needed a whole new system. They found a $180 part. That’s why we won’t call anyone else.”
“Our upstairs used to hit 84 every afternoon. Two zones and a new thermostat later, it’s the best room in the house.”
“The price on the tablet was the price on the invoice. That alone is worth five stars.”
“The installers wore boot covers, vacuumed the attic hatch and walked me through the app. I’m a little spoiled now.”
“Switched to a heat pump and they handled every rebate form. The bill went down in January, which I did not expect.”
“During the smoke week our house air was cleaner than outside, thanks to the filter cabinet they put in.”
“Fair, fast, friendly. Our family has used them for three houses now.”
Where we drive
Average arrival time for no-heat and no-cooling calls over the last twelve months.
- Denver42 min
- Lakewood39 min
- Aurora54 min
- Arvada49 min
- Littleton50 min
- Centennial57 min
- Golden56 min
- Westminster52 min
- Highlands Ranch60 min
- Boulder64 min
Questions we hear on the phone
How fast can someone get here?
Same day for most repair calls booked before 2 p.m. For no-heat and no-cooling emergencies we dispatch around the clock, and the average arrival last year was 52 minutes.
Do you charge more for nights and weekends?
No. A repair costs the same at 2 a.m. on a Sunday as it does at 10 a.m. on a Tuesday.
Should I repair my system or replace it?
A rough rule: if the system is over 12 years old and the repair costs more than a third of a replacement, start pricing a new one. Your tech will give you both numbers and let you decide.
Is a heat pump enough for a Colorado winter?
Modern cold-climate heat pumps keep heating well below zero. We size them for your coldest nights and can pair one with your existing furnace as a backup if you want the extra insurance.
How often should I change my filter?
Every one to three months for a standard 1-inch filter, more often with pets or during smoke season. Thicker media filters last six months to a year.
What does a new system cost?
It depends on the size of the house, the ductwork and the equipment, so we quote it in person for free. Financing starts at $89 a month, and rebates can take a real bite out of heat pump prices.
Do you work on brands you didn’t install?
Yes, every major brand and most of the minor ones. Our trucks carry universal parts for the common repairs.
What rebates can I get on a new system?
The federal tax credit for heat pumps and central air ended for systems installed after December 31, 2025, so we won’t promise it. Utility rebates, state programs and manufacturer promotions still take real money off, and they change often. We check what’s live for your address and file the paperwork.
Who’s actually coming into my house?
An ONDO employee, never a subcontractor. Every technician is background-checked, drug-screened and NATE-certified, and you’ll get their name and photo by text before they arrive.
Still stuck? Call (720) 555-0172. A person answers.
Let’s get it to 72°.
No heat or no cooling right now? Skip the form and call (720) 555-0172. A dispatcher answers 24 hours a day.