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Mon-Fri · 8am-5pm · evenings & Sat by appointment Serving the South Denver Metro

Honest HVAC. Done right.

Heating, cooling, and air quality for homes and small commercial spaces across the South Denver metro.

Something not working right? Tell us what's going on.

4.9across 410+ reviews
Guaranteedworkmanship
Licensed& insured

Licensed & insured

Contractor licenses across the South Denver metro, EPA Section 608 certified for refrigerant work, and insured.

Warranty approved

Approved with several of the major home warranty companies. We diagnose it, file it, and handle the fix once it's approved.

Guaranteed work

Hire us directly and installs carry a year, repairs 90 days. Full terms are on every estimate and invoice.

Local & family-run

Family-owned and operated, based right here in the South Denver metro.

Services

Heating, cooling & air quality.

If it's a central AC, furnace, or heat pump, we work on it. Repairs, replacements, and tune-ups.

AC repair & install

If it's blowing warm, making a noise it didn't used to make, or just can't keep up, we'll find out why. And if it's genuinely past saving, we'll tell you that too.

Furnace repair & install

If it won't kick on, or you just want a tune-up before it gets cold, we work on all major gas and electric models, old or new.

Heat pump service

We repair, maintain and install ducted heat pumps, including the cold-climate models. Wondering if one makes sense for your house? We'll give you the straight answer, whichever way it goes.

Indoor air quality

Colorado winters are dry, and you feel it in chapped lips and static shocks. A whole-home humidifier fixes that. Dust, pollen and wildfire smoke are a different problem, and that's what an air cleaner is for.

Small commercial

Heating or cooling trouble at your business? We work on the same systems in light commercial spaces: small offices, retail spaces, and similar buildings.

Home warranty work

We diagnose it and submit it. Once they've decided what's covered, we sort the parts and get it fixed. Simple repairs can be done on the same visit.

Been told you need a whole new system?

Before you spend that money, let us take a look. If it can be repaired, we'll tell you. If it really does need replacing, we'll quote it. The diagnosis is $129, and it comes off the bill if you go ahead with the replacement within 30 days.

About High Plains Air

Who we are.

Nobody calls an HVAC company on a good day. By the time you're looking us up, the house is already too hot or too cold and you want it handled.

High Plains Air is a family-owned and operated HVAC company. We've built this company on decades in the trade. We're licensed and insured, and we stand behind what we do. When you call, it's our own office you're dealing with, not a call center.

Reviews

What customers say.

4.9 average across 410+ reviews, collected automatically after completed jobs, from the customers we did them for.

Past Work

A look at our work.

Real jobs from around the metro. Tap any photo to see it up close.

Service Area

Where we work.

We cover these South Denver metro communities and the neighborhoods in between. Don't see yours? Give us a call, there's a good chance we cover you too.

South Denver metro
Highlands Ranch Littleton Ken Caryl Columbine Roxborough Englewood Cherry Hills Village Greenwood Village Centennial Lone Tree Castle Pines Castle Rock Parker SE Aurora
FAQ

Common questions.

A few things people ask before they call. Don't see yours? Just ask.

Scheduling and pricing

How soon can you come out?

Depends on the season and how booked we are. Give us a call and we'll tell you exactly when we can be there.

How much is a service call?

$129. That covers the trip and a full diagnosis. Approve the repair while we're there and it comes off that bill. On a replacement it comes off if you go ahead within 30 days. If you already know you're replacing and don't need anything diagnosed, the quote is free.

Do you offer evenings or weekends?

Yes. Give us a call and we'll get out to you if we can. We can't promise same-night, but we'll tell you straight away what's realistic. There's a $200 after-hours charge for evenings and Saturdays, and we'll say so before we come out. Sundays we're with our families, back Monday morning.

What areas do you serve?

The South Denver metro, including Highlands Ranch, Littleton, Centennial, Lone Tree, Castle Rock, and Parker. If you're just outside it, call us anyway, there's a good chance we can still get to you.

Home warranty work

Do you work with home warranty companies?

Yes, we're an authorized contractor for several of the major ones. We diagnose it, file the claim, and handle our side of the back-and-forth with them. You pay your service fee straight to them, not to us. Worth knowing: what your plan covers is their call, not ours. We'll tell you exactly what we found and what we sent them, and we'll push for you, but they decide.

How does warranty coverage work?

Your plan decides what's covered. The rest, what warranty companies call non-covereds, is usually things like refrigerant, permits, code upgrades or hauling the old equipment away. Your plan sets that list, not us. We price it out, send it over, and they tell you what's yours.

If they deny the whole claim, you're only out the service fee you paid them. We don't add a charge of our own for the visit.

My warranty claim seems stuck. Who do I call?

Call or text us and we'll tell you exactly where it stands. A claim moves through a few steps: we diagnose and send our report, your plan reviews it and decides what's covered, parts get ordered, and then we schedule the repair. Whichever step yours is on, we'll tell you what it is and what comes next.

What if you need a part?

Most repairs we finish on the same visit. Sometimes a part has to be ordered, either because it's not something we stock or because your warranty company orders it themselves. That means a second trip. We'll tell you what it needs, let you know as soon as the part's in, and if you're on a deadline, we'll lay out any faster options and what they'd cost.

Caring for your system

Should I do anything before you get here?

If it's not working, go ahead and shut it off. One exception: if there's ice on the lines or barely any air coming out, it's probably frozen. In that case turn the cooling off but leave the fan on, a few hours before we get there if you can. That gives the ice time to melt so we can check everything properly. If it's still running fine and we're just coming for a tune-up, leave it alone.

Do I need to clean up before you get here?

Yes and no. We don't care about the mess. People apologize for their basements all the time, and we've seen worse. Much worse. We do care about reaching the equipment, so anything piled against the furnace needs to scoot. Everything else can stay right where it is.

What should I set the thermostat at?

Somewhere it can actually shut off. A properly sized system around Denver is designed to hold about 75 when it's in the low 90s outside, and on those days it'll run most of the day doing it. When it's over 100, expect a few degrees warmer. Setting it way lower won't cool the house any faster, it just runs nonstop, and long nonstop runs are when coils tend to ice up.

How often should I change the filter?

Check it once a month and change it when it looks dirty. Some homes go through them quick, others go a few months. A clogged one starves the system of air, and that's when the coil ices up and you get no cooling at all.

Ice on the lines, or barely any air coming out?

That's usually a frozen system, and it's one of the most common things we see around Denver. Often it's something simple, like a dirty filter or a hot day with the thermostat set low. Sometimes it's bigger.

Turn the cooling off but leave the fan on. Pull the filter out and give it a few hours to thaw. Then put a fresh filter in and set it to 75 or higher. The frozen ones we see are usually set to 70 or lower. If it still ices up at 75, it's not the setting, and it's worth a call.

If yours keeps doing it, or you just like it colder than the system wants to run, there's a control we can add that shuts the system off before ice can build up. Ask us about it.

Does Denver's altitude affect heating and cooling?

Yes, measurably. The air up here is about 15 percent thinner than at sea level, and thinner air carries less heat. Gas furnaces are set up for altitude by code, following the manufacturer's high-altitude instructions. Cooling equipment gives up a few percent of capacity for every thousand feet of elevation, which is one reason systems run long here on hot days. Thinner air also leaves airflow less margin, so the filter matters more at altitude than most people realize: a restriction you might get away with at sea level is how coils ice up here. It's why we talk about filters so much, and why equipment should be sized and set up for this elevation, not sea level.

About our work

What brands do you work on?

All the major ones, Trane, Carrier, Lennox, Goodman, Rheem, and just about anything else, at any age.

Do you work on swamp coolers or mini-splits?

Swamp coolers, no. Mini-splits we install but don't repair. The bulk of our work is central AC and gas and electric furnaces, and we know ducted heat pumps well.

Is R-22 banned?

No. What stopped back in 2020 was making and importing new R-22. Servicing existing systems with recovered or reclaimed R-22 is still fully legal, and we still work on them. Supply gets tighter every year, so it costs more than it used to. Whether yours is worth fixing or replacing depends on the shape it's in. If someone told you it's illegal and quoted you a whole new system, call us for a second opinion.

What about R-410A?

Same deal. Nothing about having it means you need a new system, and we can still repair it. New air conditioners and heat pumps built since 2025 use a different refrigerant, and R-410A production is being phased down on a federal schedule. As with R-22, if the refrigerant is the only reason someone quoted you a replacement, have us take a look first.

Do you guarantee your work?

Yes. Hire us directly and installs are covered for a year, repairs for 90 days. If something we did isn't right, we make it right. It covers our workmanship, not parts supplied by you or a warranty company, and warranty repairs follow that plan's own terms. Full terms are on every estimate and invoice.

Are you licensed and insured?

Yes. We hold contractor licenses across the South Denver metro and we're insured. When a job needs a permit, we're licensed with that building department before we pull it. Everyone who handles refrigerant here is EPA Section 608 certified. Happy to send our certificate if you need it.

Get in touch

Tell us what's going on.

Give us a call or text, or fill out the form below. Reach us during business hours and we'll usually get back to you the same day.

Hours
Mon-Fri8am-5pm EveningsBy appointment (+$200) SaturdayBy appointment (+$200) SundayClosed

We come to you. There's no shop to visit.

Service rates

Free Quotes on new AC, furnace, and heat pump replacements. If you already know you're replacing, there's no charge to come out and price it.

$129 Standard service call, for when something's wrong and needs diagnosing. Covers the trip and a full diagnosis. Approve the repair while we're there and it comes off that bill. On a replacement it comes off if you go ahead within 30 days.

+$200 After-hours charge, which applies to any visit starting after 5pm on a weekday, or any time on a Saturday. Call us and we'll get to you if we can. Sundays we're closed, back Monday morning.

We take cards, checks, and cash. If you're a home warranty customer, you pay your service fee directly to your warranty company, not to us.

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