Prompt Scheduling by Phone
Call (720) 806-7634 and tell us what your system is doing. We schedule visits by phone and keep the conversation plain and direct.
Denver HVAC contractor
HVAC Denver CO: Heating and Cooling Done Right
When your furnace quits on a cold Denver night or your AC stops cooling in July, call Lion Tech Home Services. We repair, install, and maintain furnaces, heat pumps, boilers, and air conditioning in Denver, Colorado — sized for 5,280 feet, with cold-climate heat pumps and dual-fuel systems for homes that need them. We are open 24 hours, 7 days a week.
5.0★★★★★11 Google reviews
Open24 hours · 7 days a week
Phone is the fastest way
Call us today
Call (720) 806-7634 and tell us what your system is doing. We are open 24 hours, 7 days a week.
Call Now (720) 806-7634 → No spam. No obligation. Just practical help.01
Clear first stepWe explain what we find before work starts
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Respectful serviceClean floors, clear communication
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Careful finishWe test the system before we leave
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Denver experienceLocal know-how for Denver homes
Real work. Real accountability.
Built for better service
Denver HVAC Company Built on Straight Answers
Lion Tech Home Services handles HVAC work in Denver, Colorado, for homeowners and small commercial properties. We repair furnaces, boilers, heat pumps, and air conditioners, and we install new systems when repair no longer makes sense. Denver is a furnace-first market — around 6,000 heating degree days against roughly 750 to 1,000 cooling degree days — so we size equipment for 5,280 feet and for cold-climate heat pumps and dual-fuel setups, not for sea-level nameplates.
What separates us is how we diagnose. We use a manifold gauge set, vacuum pump, and leak detector to find the actual failure instead of guessing at parts. We work across Denver neighborhoods including Capitol Hill, Cherry Creek, Washington Park, and Highland. If you need HVAC help in Denver, call (720) 806-7634 and talk to us directly.
- ✓ Prompt Scheduling by Phone
- ✓ Straight Talk, No Pressure
- ✓ Stocked Trucks, Fewer Return Trips
What we do
Heating and Cooling Services in Denver
One call covers the whole system: cooling, heating, ductwork, and air quality. Whether you need air conditioning repair in August or a furnace tune-up before the first hard freeze, we size the equipment to your house and to Denver's altitude — around 6,000 heating degree days a year in climate zone 5B — not to a sales quota.
Air Conditioning Repair
We diagnose AC not cooling, short cycling, and frozen coils with a manifold gauge set and leak detector, then repair the fault we find.
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Air Conditioning Installation
New AC installs sized with a Manual J load calculation so you are not paying to cool air you do not have. We set the pad, run copper tubing, pull the permit, and test the charge before we leave.
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Air Conditioning Maintenance
A spring tune-up keeps your condenser clean and your capacitor tested before the July heat hits. We check refrigerant charge, wash the coil, and replace the air filter before the summer heat arrives.
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AC Tune-Up
Our AC tune-up covers amp draw, capacitor health, thermostat calibration, and condensate line flow. Denver's dust and pollen clog coils fast, so we clean the fins and flush the condensate line.
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Central Air Conditioning Services
Whole-home central AC service for split systems and packaged units. We balance airflow, seal leaky ductwork, and verify the blower motor moves the CFM your system was designed for.
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Ductless Mini-Split Installation
Mini-splits are ideal for Denver additions, garages, and older homes without ductwork. We mount the head, run the line set, and commission the system for quiet, zoned comfort.
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Ductless Mini-Split Repair
A frozen mini-split usually means low charge or a dirty filter. We recover refrigerant, pressure-test the line set, and repair the fault so your zoned system cools again without a full replacement.
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Furnace Repair
Furnace blowing cold air, a tripped furnace breaker, or a failed igniter — we test the combustion readings and replace blower motors and capacitors from stock.
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Furnace Installation
We install furnaces sized for Denver's altitude and cold winters. Every install includes a combustion test and the required permit so the job is code-correct.
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Furnace Maintenance
Fall furnace maintenance cleans the burners, checks the heat exchanger, and verifies carbon monoxide levels. We replace the air filter and test the thermostat wire so you are not calling us on the coldest night of the year.
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Heating System Repair
From boilers to heat pumps, we repair the heating side of your system. We stock thermostats, capacitors, and blower motors, so many heating repairs finish in a single visit.
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Heating System Installation
New heating installs for homes and small commercial spaces. We size the equipment, run new gas or refrigerant lines, and pull the required permit before the first test fire.
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Heat Pump Installation
Cold-climate heat pumps work well in Denver when they are sized and charged correctly. We install inverter-driven systems and set the defrost controls for our altitude and dry air.
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Heat Pump Repair
Heat pump loud noise, reversing valve failure, and defrost board faults are common calls. We diagnose with a multimeter, recover refrigerant, and repair the fault rather than pushing a replacement.
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Heat Pump Maintenance
Twice-a-year heat pump service keeps the reversing valve and defrost cycle working. We clean coils, check refrigerant charge, and test the auxiliary heat so winter mornings stay warm.
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Boiler Repair
Boiler leaking water or losing pressure — we test the expansion tank, relief valve, and circulator pump, then repair the leak and refill the loop to the correct pressure.
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Boiler Installation
New boiler installs for Denver homes with radiators or baseboard heat. We size the unit, pipe the near-boiler header, and test the combustion analyzer before we hand over the keys.
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Boiler Maintenance
Annual boiler service flushes the loop, tests the relief valve, and checks the low-water cutoff. Clean boilers use less gas and last longer, which matters when January nights drop below zero.
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Emergency HVAC Services
No heat at 2 a.m. or no cooling during a 98-degree stretch — call (720) 806-7634. We are open 24 hours, 7 days a week, with stocked trucks ready to roll.
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24-Hour HVAC Repair
Our phones are answered around the clock. If you need HVAC repair in Denver, call (720) 806-7634 and tell us what your system is doing.
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Commercial HVAC Services
Rooftop units, split systems, and make-up air for Denver restaurants, offices, and retail. We work around your business hours and keep refrigerant logs and filter schedules current.
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Residential HVAC Services
Full-service residential HVAC for Denver homes, from a clogged AC filter to a full system replacement. We treat your house like we live there: shoe covers, drop cloths, and a clean job site.
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HVAC Maintenance Plans
Regular maintenance visits keep small faults from becoming big ones — an AC check before summer and a furnace check before the first freeze. Call (720) 806-7634 to ask about a maintenance plan for your home.
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Preventive HVAC Maintenance
Preventive maintenance catches small faults before they strand you. We test capacitors, clean coils, seal ductwork, and log refrigerant pressures so you can see the system trending over time.
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Indoor Air Quality Services
Denver's dry air and wildfire smoke make filtration a real concern. We install media filters, UV lamps, and humidifiers that help with dust, pollen, and smoke particles inside your home.
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Air Duct Cleaning
Dirty air ducts push dust and allergens through every room. We use duct cleaning equipment with negative air pressure to pull debris out, not just stir it around.
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Duct Sealing
Leaky ductwork can waste 20 to 30 percent of your conditioned air. We seal joints with duct sealant and mastic, then verify airflow at the registers so every room gets its share.
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Duct Repair
Crushed, disconnected, or rodent-damaged ducts get repaired with new flex or sheet metal. We inspect the run, replace the damaged section, and seal it so your system stops losing air in the attic.
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Duct Installation
New duct systems for additions, remodels, and homes that never had central air. We design the layout, size the trunk lines, and insulate runs so you get even temperatures room to room.
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Our standard
Why Denver Homeowners Call Lion Tech
Plenty of companies will sell you a new system. We would rather fix what you have and show you the readings that prove it. Here is what you get when you call us.
Straight Talk, No Pressure
We explain what we found and what your options are before any work starts, and we do not push a replacement when a repair will do. The decision stays yours.
Stocked Trucks, Fewer Return Trips
Our vans carry capacitors, blower motors, thermostats, refrigerant, and common igniters, so many repairs finish in a single visit.
From call to complete
How Our Denver HVAC Service Works
Call (720) 806-7634 and tell us what your system is doing. We are open 24 hours, 7 days a week.
Our tech tests the system with a multimeter, manifold gauge set, and leak detector. You get a plain-English explanation of the fault before any work starts.
We complete the repair with parts from the truck, or install new equipment sized with a Manual J load calculation for your home.
We run the system, verify temperatures and refrigerant charge, and show you the readings. You get a clean job site when we leave.
STEP 01Call Us
Call (720) 806-7634 and tell us what your system is doing. We are open 24 hours, 7 days a week.
Call before it gets worse
Common Denver HVAC Problems We Fix
Denver's altitude, dry air, and temperature swings wear on equipment in ways coastal cities never see. These are the calls we run most often, and how we handle them.
Ask a pro →AC not cooling on a 98-degree July afternoon
Low refrigerant or a failed capacitor are common causes. We check pressures with a manifold gauge set, find the leak, repair it, and recharge the system.
Furnace blowing cold air in the middle of January
A dirty flame sensor or failed igniter is the usual cause. We clean or replace the part, test the combustion readings, and confirm the furnace holds temperature before we leave your house.
Heat pump making a loud noise at 6 a.m.
Loud noise often means a failing reversing valve or a fan motor bearing. We diagnose with a multimeter, recover the refrigerant, and repair the fault so the system runs quiet again.
Boiler leaking water onto the basement floor
We shut the system down, find the source, and repair the leak. Common culprits are a failed relief valve or a cracked expansion tank. We refill the loop to the correct pressure and test.
Neighbors recommend us
What Denver Customers Say
★★★★★
“I would recommend Martin and Lion Tech for a home repair in a heartbeat. He did a great job repairing an old pipe that had a leak under my sink. If it hadn't been caught in time, it could have been a disaster! Martin was very quick to fix the major pipe and i had him install a garbage disposal as well. He was very quick and cleaned up everything. It's been a month now. Since the repair and everything works great!”
TC
Troy Cowling2 years ago · Google review
✓ Google review★★★★★
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“Martin was very prompt in responding to our requests and completing the work on a timely basis. His expertise is HVAC but he is very capable in all home maintenance areas. We have complete confidence in Martin's abilities and work and will call on him for any future projects we might have.”
JS
JERRY SUNDBY4 years ago · Google review
✓ Google review★★★★★
“Martin was great! Timely, knowledgeable, and his experience showed. He was able to fix our HVAC that had been having trouble on and off for awhile. Pricing was good and reasonable! Would certainly recommend!”
J
Julie2 years ago · Google review
✓ Google review★★★★★
“My dishwasher and oven were both broken and he came out and fixed the dishwasher that same day! The oven needed a replacement part that the local place didn't have, but he shipped it in promptly and got it fixed as soon as possible! He was very personable and talked through what he was doing, he tried the cheapest and simplest fixes first, and worked his way from there.”
AE
Alex Eyers2 years ago · Google review
✓ Google review★★★★★
“Martin does great work, is very transparent about costs, and most importantly backs up his work and will double back if needed without a question. I'll absolutely be using Lion Tech again when I need help around my homes.”
DE
Dominic East2 years ago · Google review
✓ Google review★★★★★
“Martin was very professional and got the job done! We have already referred him to several other neighbors and has completed their projects! We feel very fortunate to have found him! He is so proficient and knowledgeable in many areas.”
CM
Cheryl Mclaughlin4 years ago · Google review
✓ Google review★★★★★
“Martin was fantastic with the service he provided in repairing our dishwasher. Very helpful and very professional. Will be using LION TECH again and would highly recommend them for any repair . GREAT JOB and MUCH THANKS. Angie”
TK
Taryn Kersey4 years ago · Google review
✓ Google review★★★★★
“Martin was a joy to work with, showed up , on time, knows his business and charming to boot. What more can I say? I will surely call him again - as needed.”
VR
Victoria Robertsa year ago · Google review
✓ Google review★★★★★
“Absolutely excellent service - very responsive and able to work until the job is done right. Was super impressed by the support on our fireplaces and furnace - nice to have all up and working again! Many thanks”
JE
John-Erik Emmetsbergera year ago · Google review
✓ Google review★★★★★
“Martin is great. Quick response time and timely, well done repairs.”
KB
Karen Burch2 years ago · Google review
✓ Google review★★★★★
“Great service. Very professional! Highly recommend”
WD
William Darcey2 years ago · Google review
✓ Google review
Local by design
HVAC Service Across Denver
We work in Denver neighborhoods across the city, from Capitol Hill to Montbello. We know the older homes in Congress Park and the newer builds in Central Park, and we carry the parts to fix both.
Not sure your neighborhood is listed? Call (720) 806-7634 and ask.
Primary service zone
Good questions
HVAC Denver CO Questions, Answered
These are the questions we hear most from Denver homeowners. If yours is not here, call us at (720) 806-7634 and we will give you a straight answer.
(720) 806-7634 →Repair costs depend on the system, the fault, and the parts involved, so we do not publish prices online. Call (720) 806-7634, describe what your system is doing, and we will talk through the visit before any work starts.
Look for a contractor who explains the fault in plain language, sizes new equipment to your home with a Manual J load calculation, and pulls the required permits. Colorado has no state HVAC licence, and Denver licenses HVAC work locally — ask what local credentials and experience a company holds.
The usual causes are a dirty filter, a failed capacitor, low refrigerant from a leak, or a frozen coil. Denver’s altitude and dry air make correct sizing and charge especially important. If your system is not cooling, call (720) 806-7634 and describe what you see and hear.
Call us any time you have no heat when it is below freezing, no cooling during a heat wave, or you smell gas. If you smell gas, leave the home and call your gas utility or 911 first. We are open 24 hours, 7 days a week.
Yes. At 5,280 feet the air is about 82% as dense as at sea level, so furnaces lose output and air conditioners lose capacity unless the equipment is sized for altitude. That is why new systems should be sized with a Manual J load calculation done for Denver conditions, not by nameplate ratings alone.
Ready when you are
Ready to book your Denver HVAC visit?
No heat, no cooling, or a system making noise? Call Lion Tech Home Services at (720) 806-7634. We are open 24 hours, 7 days a week.
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Call us
Contact Lion Tech Home Services
Call (720) 806-7634 — phone is the fastest way to reach us. We are open 24 hours, 7 days a week.
Call anytime(720) 806-7634
Visit7575 E 29th Pl #4052, Denver, CO 80238
Office hoursOpen 24 hours · 7 days a week