AC Repair in Longmont, CO
When the air conditioner quits on a hot Front Range afternoon, M&M answers around the clock with a NATE-certified technician and upfront pricing.
Fast, Honest Air Conditioning Repair for Longmont Homes
An air conditioner rarely fails at a convenient time. It is usually the first real heat wave of the summer, the house is getting uncomfortable, and every company in town is slammed. M&M Heating, Cooling, Plumbing & Electrical has been the call Longmont homeowners make in that moment since 1996, and we still answer it 24 hours a day with no extra charge for nights or weekends.
Our NATE-certified, licensed and insured technicians repair every make and model of central air conditioner and heat pump. They arrive with the diagnostic tools and common parts to fix most problems in a single visit, and they explain what went wrong in plain language before any work starts. You see the price upfront and approve it first. No surprises on the invoice.
Front Range conditions are tough on cooling equipment. Thin, dry air at altitude makes condensers work harder to shed heat, cottonwood seed and dust clog outdoor coils, and hard water leaves scale in condensate lines. We see the same failures every summer, which means we know where to look and how to fix them for good.
If your system is older and repairs are piling up, we will say so and lay out the numbers honestly. Our AC replacement page explains how we help you decide. And once your air conditioner is running again, a yearly AC tune-up is the best way to keep it that way.
Common Air Conditioner Problems We Fix
If any of these sound familiar, do not wait for the system to fail completely.
Blowing Warm or Weak Air
Warm air at the vents usually means low refrigerant from a leak, a failed capacitor or compressor, or a frozen evaporator coil. Weak airflow often traces to a clogged filter or a blower motor on its way out.
Grinding, Squealing or Banging
New noises are the system asking for help. Squealing points to a motor bearing, grinding to a failing motor, and banging or rattling to a loose part inside the outdoor unit. Shut it off and call before a small part takes out a big one.
Water Around the Indoor Unit
A clogged condensate drain line or a failed condensate pump backs water up into the furnace cabinet or onto the floor. Hard water scale makes these clogs common in Longmont, and the water damage adds up fast.
Short Cycling or Running Nonstop
An AC that starts and stops every few minutes, or one that never shuts off, is wasting energy and wearing out its compressor. Causes range from a bad thermostat to refrigerant problems to a system that was never sized correctly.
Will Not Start or Keeps Tripping the Breaker
A tripped breaker, failed contactor, bad capacitor or wiring fault can stop the system cold. Electrical faults are also a safety concern, so leave the breaker off and let a licensed technician find the cause.
Musty or Burning Smells
A musty smell often means mold on a damp coil or in the drain pan. A burning or electrical smell means shut the system off right away. Either way, we track down the source instead of masking it.
The M&M Difference
What you get when a Longmont family business shows up at your door.
Here When the Heat Hits
AC breakdowns do not wait for business hours. We are open 24/7, 365 days a year, and we never charge extra for nights, weekends or holidays.
NATE-Certified Diagnosis
Our technicians hold the industry's top certification and keep training, so you get an accurate diagnosis the first time instead of a parts-swapping guess.
Upfront Pricing, Always
You will know the full cost before we pick up a tool. Approve it, decline it or ask for other options. The decision is always yours.
100% Satisfaction Guarantee
Family-owned in Longmont since 1996, we stand behind every repair. If something is not right, tell us and we will make it right.
Our 4-Step Process
From first call to cool air, here is how an M&M repair visit works.
Call Any Time
Reach us day or night. We will ask what the system is doing, suggest a few quick checks you can do safely, and get a technician scheduled, often the same day.
Thorough Diagnosis
Your technician tests refrigerant pressures, electrical components, airflow and controls to pinpoint the real cause, not just the symptom.
Clear Options and Pricing
We explain what failed, why it failed and what it costs to fix. If repair is not the smart money, we will tell you that too.
Repair, Test and Verify
With your approval we complete the repair, run the system through a full cycle and confirm temperatures and pressures are where they should be before we leave.
AC Repair Questions We Hear Most
How fast can you get to my home in Longmont?
We are open 24/7 and dispatch from our shop on S Bowen Circle in Longmont, so we are close to most of the Front Range communities we serve. Call as soon as you notice a problem and we will give you an honest arrival window. We do not promise a response time we cannot keep, but we do our best to get no-cooling calls handled quickly during heat waves.
Should I turn the AC off while I wait?
If the system is making loud noises, smells like something is burning, or the indoor coil is frozen, yes. Shut it off at the thermostat so you do not damage the compressor. If it is simply blowing warm air, you can switch the fan to on to keep air moving. Setting the thermostat a few degrees higher than usual also keeps the system from straining until we arrive.
Is it worth repairing an older air conditioner?
Often, yes. A single failed capacitor or contactor on a well-maintained system is a quick, affordable fix. The math changes when the compressor fails, the system uses an older refrigerant that is expensive to source, or you are calling for repairs every summer. We will give you both numbers and let you decide. Our AC replacement page covers the trade-offs in more detail.
Do you repair all brands of air conditioners?
Yes. Our NATE-certified technicians service every major make and model of central air conditioner, heat pump and ductless mini-split, regardless of who installed it or how old it is. We carry common parts on the truck and can source the rest quickly.
Why is my AC freezing up?
Ice on the refrigerant lines or indoor coil usually means restricted airflow or low refrigerant. A dirty filter, a failing blower motor, closed vents or a refrigerant leak are the usual suspects. Turn the system off, switch the fan to on to thaw the coil, and call us. Running a frozen system can ruin the compressor.
Can regular maintenance prevent these repairs?
Most of the calls we take in July trace back to a dirty coil, a weak capacitor or a clogged drain, all things a spring tune-up catches. Our Loyalty Club includes a 23-point A/C precision tune-up every year plus discounts on repairs and priority scheduling, which matters when every company in town is backed up.
No Cool Air? Call M&M Day or Night.
Open 24/7 | Emergency Service Available
Call (720) 608-3973AC Repair Across the Front Range
Proudly serving Longmont, CO and surrounding communities including Erie, Frederick, Firestone, Dacono, Mead, Johnstown, Berthoud, Niwot, Gunbarrel, Lafayette, Louisville and Superior.
Primary Service Area
- Longmont, CO
- Erie, CO
- Frederick, CO
- Firestone, CO
- Dacono, CO
Extended Area
- Mead, CO
- Johnstown, CO
- Berthoud, CO
- Niwot, CO
- Gunbarrel, CO
Also Serving
- Lafayette, CO
- Louisville, CO
- Superior, CO
