45 AC Installation Contractors in Longmont, CO
Top-Rated AC Installation Contractors in Longmont
Prime Performance Mechanical
“5 of 6 displayed reviews carry 5-star ratings, with owners consistently noting the founder's hands-on involvement. Single negative feedback centered on…”
M and M Heating, Cooling, Plumbing and Electrical
“Every reviewer in the sampled set awarded 5 stars, and none of those reviews expressed concerns about pricing or callbacks. Karl Moeller explicitly noted that…”
All AC Installation Contractors (45 total)
My Guy Heating and Air (Firestone)
“All six detailed reviews award 5 stars, with each reviewer voluntarily naming specific technicians, Bob,…”
Blue Valley Heating & Cooling
“1181 reviewers maintain a 4.8-star average, with multiple five-star reviews praising specific technicians by…”
Mountain Valley Plumbing and Heating
“Every reviewer who awarded 5 stars named specific employees, DJ, Zach, Fernando, or Franco, demonstrating…”
TNT Home Services - Longmont
“Among 864 reviews, the 5-star feedback consistently highlights specific technicians like Craig, Adam, and…”
Horizon Appliance & HVAC
“Four recent reviews cite specific technician interactions, with two naming Tom Dorsa and Clay for positive…”
Groulx Mechanical Heating & Cooling Inc.
“All five reviewers awarded five-star ratings, with each account mentioning specific team members by name.…”
KJ Thomas Mechanical
“All 252 reviews carry 5-star ratings, with customers consistently praising honest estimates, on-time…”
Colorado's Finest Heating and Air Conditioning
“215 reviews yield a 4.9 average rating, with Jordan mentioned specifically across multiple five-star reviews…”
Streamline Plumbing, LLC
“149 of 150 reviewers award 5 stars, praising same-day service, flat hourly pricing, and technician…”
Your Comfort Heating & Cooling
“Every reviewer awarded a perfect 5-star rating, with Dean named directly in six of seven published…”
Carroll Mechanical Services
“All 77 reviewers awarded 4 or 5 stars, with customers specifically praising technician knowledge, transparent…”
Bliss Water Heater & Boiler Repair Service
“All 72 reviews carry 5-star ratings, with customers frequently mentioning free troubleshooting, same-day…”
Homerun Heating & Air
“All 73 Reviews Carry 5-Star Ratings, Indicating Uniformly Positive Client Experiences. Technicians Taggar,…”
ThermaCare HVAC Repair
“Every reviewer awards 4 or 5 stars, with most giving 5 stars. Positive feedback consistently mentions the…”
ComfortFlow HVAC Repair
“Across 57 reviews, the aggregate rating sits at 4.9 stars, with customers frequently citing same-day response…”
Circulating Air Inc
“All five detailed reviews award 5 stars, with technicians Tony and Bob named specifically for diagnostic…”
Stone Heating & Air
“Sixth-month review demonstrates consistent praise: all five-star ratings mention fair pricing and transparent…”
McColl Electrical Services, LLC
“Forty-nine reviews yield a 4.8-star average, with technicians Dominic and John appearing across most positive…”
Highland Heating & Air, Inc.
“5 of 7 reviewers assign 5-star ratings, with Chris, Scott, Jack, and Ashley named as individual technicians.…”
Innovations Mechanical LLC
“All six accessible reviews award five stars, with Derek mentioned by name in five of them and Patrick named…”
SAC Mechanical Heating & Air Conditioning
“Three reviews yield two five-star endorsements citing responsive same-day arrival, thorough furnace…”
Colorado Green Plumbing, Heating & Cooling
“All 30 reviews award 5 stars, with multiple reviewers specifically mentioning fair pricing, accurate…”
Orban Air Solutions LLC
“Twenty-seven reviewers awarded perfect 5-star ratings, with multiple customers noting same-day emergency…”
Woelfel Heating & Air
“Five of seven detailed reviews award 5 stars, with technicians named in each top rating. Positive feedback…”
Dan's Heating and Cooling
“All 9 reviews award 5 stars, with 3 mentioning same-day or prompt response times. Pricing appears in 4…”
Longmont Heating and Air Cooling Contractors
“All 12 reviews carry 5-star ratings, with multiple customers highlighting same-day emergency response…”
AC Installation Costs in Longmont
New central AC installation costs in Longmont, by system type and brand.
| Service | Low | Average | High |
|---|---|---|---|
Window unit | $168 | $392 | $784 |
Ductless mini-split (single zone) | $2,240 | $5,040 | $8,960 |
Central AC replacement (existing ducts) | $3,920 | $7,280 | $13,440 |
Central AC new install (with ductwork) | $7,840 | $13,440 | $22,400 |
Carrier (residential) | $4,256 | $6,944 | $11,760 |
Trane (residential) | $5,600 | $9,856 | $15,232 |
Lennox (residential) | $3,920 | $7,280 | $13,440 |
Rheem (residential) | $3,584 | $6,160 | $10,080 |
Prices reflect continental metro averages compiled from published industry cost guides, contractor surveys, and regional labor data. Last updated: April 2026.
AC Installation in Longmont, CO: What to Expect
Longmont sits on Colorado’s northern Front Range where high-altitude summers push daytime highs into the upper 80s and winters dip into the teens. Thin air at roughly 5,000 feet causes most air conditioners to derate 10–15% versus sea-level specs, and that quickens the consequences of improper sizing. With six contractors serving the area and an average 4.8 rating across 2,606 reviews, ac-installation Longmont is a focused, competitive market.
The dataset didn’t provide a usable cost range for top line items, so expect pricing to hinge on equipment size, SEER rating, ductwork condition and permit needs; unit capacity must be increased slightly to offset altitude derating. Colorado lacks a statewide HVAC license, so confirm local municipality licensing and look for proof of insurance, permit experience and manufacturer-authorized installer status before signing a contract.
Customer highlight entries were not supplied, so patterns in individual technician names or comments aren’t available. Still, review summaries show a market where four of six firms advertise 24/7 service—availability matters. Prioritize contractors who document load calculations, show prior installations nearby, offer clear warranties and can reconcile sizing with the area’s heating-dominant load profile.
Frequently Asked Questions
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All HVAC Contractors in Longmont, CO
Complete directory of 71 contractors — browse alphabetically
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All HVAC Contractors in Longmont, CO
Complete directory of 71 contractors — browse alphabetically