Cooling & Heating
Repair & Installation
Complete home comfort from the team Longmont and the Front Range has trusted for nearly 30 years. AC, furnace, ductwork, and indoor air quality — all under one roof.
Your Complete Home Comfort Team
Colorado weather demands a lot from your heating and cooling systems. From 100° summer days to below-zero winter nights, your HVAC equipment needs to perform reliably year-round — and when it doesn't, you need a team that can fix it fast.
M&M has been keeping Front Range homes comfortable since 1996. We service and install all major brands of air conditioners, furnaces, heat pumps, and ductwork. Whether you need a quick repair, seasonal maintenance, or a complete system replacement, we show up on time, explain your options upfront, and stand behind every job.
Our Heating & Cooling Services
From emergency repairs to full system replacements, we handle it all.
Air Conditioning
AC repair, maintenance, and replacement. We keep you cool all summer with reliable, efficient service.
Learn MoreFurnace & Heating
Furnace repair, maintenance, and replacement. Stay warm through Colorado's toughest winters.
Learn MoreDuctwork
Duct repair, sealing, and installation. Proper ductwork means better efficiency, comfort, and air quality.
Learn MoreIndoor Air Quality
Air purification, filtration, humidity control, and ventilation solutions for healthier indoor air.
Learn MoreAC Repair, Maintenance & Replacement
Keep your home cool and comfortable all summer long.
AC Repair
When your AC stops cooling, makes strange noises, or won't turn on, we diagnose and fix the problem fast. We service all major brands and carry common parts on our trucks for same-day repairs.
- Not blowing cold air
- Unusual noises or odors
- Short cycling or not turning on
- Refrigerant leaks & frozen coils
AC Maintenance
Annual AC tune-ups prevent breakdowns, lower energy bills, and extend the life of your system. Our comprehensive inspection covers every component to catch small issues before they become expensive repairs.
- Complete system inspection
- Coil cleaning & filter replacement
- Refrigerant level check
- Performance calibration
AC Replacement
When repair costs outweigh the value of your aging system, we help you choose the right replacement. We install high-efficiency units from top brands and size the system properly for your home.
- Free in-home estimates
- All major brands available
- Proper load calculations
- Financing options available
AC Not Keeping Up? We Can Help.
Call (720) 608-3973Furnace Repair, Maintenance & Replacement
Reliable heating you can count on through Colorado's coldest months.
Furnace Repair
A furnace failure in a Colorado winter is an emergency. We respond fast with same-day service, diagnose the problem accurately, and get your heat running again. We service gas, electric, and oil furnaces from all major manufacturers.
- No heat or weak airflow
- Unusual noises or burning smells
- Frequent cycling or won't stay on
- Pilot light & ignition issues
Furnace Maintenance
Annual furnace tune-ups are essential — they keep your system running safely and efficiently, catch problems early, and can prevent dangerous carbon monoxide leaks. Schedule before the cold hits for peace of mind all winter.
- Heat exchanger inspection
- Carbon monoxide safety check
- Burner & ignition cleaning
- Filter replacement & airflow test
Furnace Replacement
If your furnace is 15+ years old, needs frequent repairs, or your energy bills keep climbing, it may be time for a replacement. We help you choose the right high-efficiency unit and handle the full installation.
- Free in-home estimates
- High-efficiency options (up to 98% AFUE)
- Proper sizing for your home
- Financing options available
Furnace Trouble? Don't Wait Until It's Freezing.
Call (720) 608-3973Duct Repair, Sealing & Installation
Your ductwork delivers every degree of heating and cooling you pay for — when it's working properly.
Leaky, damaged, or poorly designed ductwork can waste up to 30% of your conditioned air before it ever reaches your living spaces. That means higher energy bills, uneven temperatures, and your HVAC system working harder than it needs to.
M&M provides comprehensive ductwork services — from sealing leaky joints and repairing damaged sections to designing and installing complete duct systems for new construction, additions, and remodels. We use advanced diagnostic tools to evaluate your entire duct system and recommend only the work that's actually needed.
Duct Sealing
Leaky ducts allow conditioned air to escape into attics, crawl spaces, and wall cavities. Professional sealing restores efficiency, improves comfort, and lowers your energy bills.
Duct Repair
Crushed, disconnected, or deteriorating ducts restrict airflow and hurt system performance. We repair damaged sections without unnecessary mess or disruption to your home.
Duct Installation
New construction, home additions, or replacing outdated ductwork — we design and install duct systems that deliver balanced airflow to every room in your home.
Duct Testing & Evaluation
Not sure if your ducts are the problem? We perform thorough system evaluations using advanced diagnostic tools to measure airflow, find leaks, and identify problem areas.
Indoor Air Quality Solutions
The air inside your home can be 2–5 times more polluted than outdoor air. We can fix that.
Dust, allergens, pet dander, VOCs from household products, and even mold spores circulate through your HVAC system every time it runs. Without proper filtration and treatment, these contaminants affect your family's health, comfort, and quality of life.
M&M offers a full range of indoor air quality solutions tailored to your home's specific needs. From high-efficiency filtration systems to whole-home humidifiers and air purification, we help you breathe easier — and protect your HVAC investment in the process.
Air Filtration Systems
High-efficiency whole-home filtration captures dust, pollen, pet dander, and fine particles that standard filters miss. We install and service media filters, HEPA systems, and electronic air cleaners.
Air Purification
UV germicidal lights and advanced purification systems neutralize bacteria, viruses, mold spores, and VOCs inside your duct system — cleaning the air throughout your entire home.
Humidity Control
Colorado's dry climate is tough on your home and health. Whole-home humidifiers add balanced moisture during winter, reducing static, dry skin, and damage to wood floors and furniture.
Ventilation
Proper ventilation brings in fresh outdoor air while exhausting stale indoor air. Energy recovery ventilators (ERVs) do this without wasting your heating or cooling energy.
The M&M Difference
Why Longmont and the Front Range trusts us for heating and cooling.
Same-Day & Emergency Service
When your AC dies in July or your furnace quits in January, we respond fast. Same-day appointments available with no extra charges for emergencies.
All Major Brands
We service and install equipment from every major HVAC manufacturer. Whatever brand you have — or want — we can help.
Upfront, Honest Pricing
You'll know the cost before we start. No hidden fees, no surprises. We don't sell you services you don't need.
One Year Test Drive
We stand behind our installations with our One Year Test Drive program — 100% satisfaction guaranteed or we make it right.
Our Service Process
Simple, transparent, and effective — whether it's a repair, tune-up, or full installation.
Call or Schedule Online
Tell us what's going on and we'll get you on the schedule. Emergency calls get priority. We'll confirm your appointment window so you're not left waiting.
Diagnose & Explain
Our technician inspects your system thoroughly, identifies the issue, and explains your options in plain language — with upfront pricing for each option before any work begins.
Repair or Install
Once you approve, we get to work. Our trucks are stocked with common parts for same-day repairs. Installations are completed on schedule with minimal disruption to your home.
Test & Follow Up
We verify everything is working properly before we leave. You'll get maintenance recommendations and warranty details — and we're always just a phone call away if you need us.
Heating & Cooling Questions
How often should I have my AC and furnace serviced?
We recommend annual maintenance for both your air conditioner and furnace. Ideally, schedule AC maintenance in spring before the cooling season and furnace maintenance in fall before heating season. Regular tune-ups prevent breakdowns, extend equipment life, and keep your system running at peak efficiency.
How do I know if I should repair or replace my AC/furnace?
As a general rule, if the repair cost exceeds 50% of a new system's price, or if your equipment is over 15 years old and needing frequent repairs, replacement usually makes more financial sense. We'll always give you honest options with pricing for both repair and replacement so you can make the right decision for your budget.
What brands do you service and install?
We service all major HVAC brands including Carrier, Lennox, Trane, Rheem, Goodman, Bryant, York, Amana, and more. For installations, we help you choose the best brand and model for your home's needs and your budget.
Do you offer financing for new HVAC systems?
Yes. We offer flexible financing options to help make a new AC or furnace installation affordable. Ask about our current financing programs when you schedule a free estimate.
How can I improve my home's indoor air quality?
Start with regular filter changes and annual HVAC maintenance. Beyond that, a whole-home air filtration system, UV air purifier, or humidifier can make a significant difference. We'll evaluate your home's specific needs and recommend the right combination of solutions — not just the most expensive option.
How do I know if my ductwork needs repair or sealing?
Common signs include rooms that are hard to heat or cool, high energy bills, excessive dust in your home, and visible damage or disconnected sections in accessible ducts. A professional duct evaluation can measure how much air you're losing and whether sealing or repair will solve the problem.
Need Heating or Cooling Service?
Open 24/7 | Same-Day & Emergency Service Available
Call (720) 608-3973Heating & Cooling Service Across the Front Range
Proudly serving Longmont, CO and surrounding communities.
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
