Mighty Plumbing and Heating LLC
“He also replaced and repaired parts missing from last years shutdown by the Cooler Company, and came back quickly to correct a float problem at no extra charge.”
Best HVAC Contractors in Denver, CO
24 companies listed · all 24 in Denver · 16 open 24/7 · 22 open weekends · 21 rated 4.5+
Data verified October 28, 2026
Time Plumbing
“Arrived and evaluated what work needed to be done and immediately left and acquired the parts required for returning my sprinkler system to operational status.”
Mountain Breeze Heating & Air
“We wound up getting caught with some pickiness unrelated to their install at our permit inspection and they sent a crew back out to take care of it for us.”
Day & Night Mechanical Solutions
“Removed and replaced a NTI matrix boiler with a new NTI system as well as installing a new gas furnace and instant water heater for basement apartment.”
Roots Heating & Air
“He conducted a thorough inspection of the HVAC system of the home my client is under contract with, taking the time to explain each step of the process to us in clear, understandable terms.”
Right Away Heating
“(Since everything was 19 years old, it was TIME) I highly recommend Right Away Heating - quality, value, professionals, responsiveness, punctuality, and kindness!”
The 24 companies listed for Denver, CO work on furnaces, heat pumps and air conditioners. Each profile repeats what the company publishes about its hours, its license and the equipment it fits, alongside ratings and quotes drawn from public reviews.
Area overview: Denver, CO
All 24 companies we list here are in Denver itself. We have 77 companies in Denver on file; this page shows the highest-rated 24. The companies on this page are rated from 4.1 to 5.0 across 38,842 reviews; all 24 have 50 or more reviews and 21 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (94%), quality (82%) and responsiveness (79%). 16 are open around the clock; 22 are open on Saturdays and 21 on Sundays. The services the companies on this page list most often on their websites are drain cleaning (2), gas lines (2), heat pump (2), heating (2) and indoor air quality (2). 5 show a license on their websites; 5 list staff certifications (EPA and NATE) and 6 have a BBB rating of A or A+. 17 have ten or more years of experience, the longest 62 years. 17 offer emergency call-outs; 18 offer financing or payment plans; 6 give free estimates; 11 are family- or locally-owned and 17 list coupons or special offers. We count these figures across the companies on this page; hours and prices change, so confirm the details with the company before you book.
Which companies listed for Denver answer no-heat calls at night?
Round the clock availability appears in 16 of the 24 listings on this page. An overnight visit is usually a diagnosis and a temporary fix, since supply counters are shut until morning. Ask what the after hours call out is before the truck leaves.
Doctor Fix-It Plumbing
“Elijah was courteous, explained everything prior to proceeding, he even showed what he was doing to my grandson, and returned everything back in place.”
Logic Hvac/r
“The best part about working with Logic HVAC/R and their crew was that they really seemed to know exactly what we wanted and how to deliver it to us at a great price.”
Squeaks Plumbing Heating & Air
“We will be calling Squeaks if anything else arises and we will definitely be asking for Islom again because we loved the work he did and his level of professionalism.”
A Better Plumber (An Absolute Plumbing Company)
“Beau came out and fixed a leak on an external faucet, he was on time and very professional, did great work didn't mind having to squeeze into a very weird little area to get to the pipe that we needed fixed and didn't complain about my dogs barking a...”
Rabbit Heating & Air LLP
“Installed both a new furnace, ac unit, and re-ran ducts, new registers, and intake in the same day, whereas other companies were 6 weeks out prioritizing larger jobs.”
Unicolorado Heating & Cooling
“Their staff were very responsive, professional and efficient in all their dealings with me and the installation process was done with respect and care.”
King Rooter & Plumbing
“Found King Rooter on google, picked them for the good reviews, and Jonathan and the rest of his team made my first-ever call to a plumber quick & easy.”
Controlling Systems
“He was friendly, punctual, respectful to tracking in dirt or dust creation from the filter replacement and knowledgeable about my furnace which is a few decades old”
Golden West Plumbing
“Pricing was similar to what I paid at my previous company that stopped providing service to swamp coolers last year, so I was okay with charges although everything cost more these days.”
Swan Plumbing
“I'm one of those customers that like to be with the tech the whole time they're at your house to better understand my system and ask all kinds of questions about it.”
Action Air Duct Cleaning Denver
“I asked that they suction up the dust bunnies in our crawlspace on the way to our furnace and to please remove the reminder sticker on our furnace from the last cleaning”
Professional Plumbers Denver
“After months of trying to repair an irrigation leak ( and 1500$) Professional Pumbers were able to repair the system and went above and beyond with the repair.”
Pasterkamp Heating and Air Conditioning
“We recently had a Mitsubishi ductless air conditioning system installed in our house and we are so pleased with the work performed by the nice people at Pasterkamp.”
Applewood Plumbing Heating & Electric
“Diagnosed quickly and fixed the issue completely -- spending 3 hours to fix 2 leaks in our mini-split system and overhaul the previous shoddy installation (another HVAC company).”
Dalco Heating & Air Conditioning
“Marc was super friendly and helpful in answering all our questions about what different types of AC, he provided multiple quotes for different options for us to consider.”
Aether Mechanical
“I selected Aether Mechanical as the sales staff were very professional and knowledgeable with this type of work, asked the right questions, and suggested self repair options over the phone.”
Heart Heating
“He was right on time for both appointments, super friendly and transparent about the issues and the suggested work, and then quick to make the repairs happen.”
Brothers Plumbing
“Matt F and his assistant Jack from Brothers Plumbing and Electric did a great job in upgrading my electrical panels, and advising on and repairing other items.”
Why these companies made our list
What customers say about companies in Denver
- “Excellent professional services. Andrew came early & did a very timely furnace inspection & flushed our water heater.” — customer of Applewood Plumbing Heating & Electric
- “All the people I have dealt with were knowledgeable, friendly, and very professional.” — customer of Mountain Breeze Heating & Air
- “Top notch crew and experience from the first visit through the install of a brand new heat pump.” — customer of Unicolorado Heating & Cooling
- “All my questions were answered. I felt no pressure to buy something that I did not need or want.” — customer of Mountain Breeze Heating & Air
Excerpts from public reviews of the companies listed on this page.
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