Maintenance
Year-Round HVAC Maintenance Schedule for Southern Utah Homes
Month-by-month and seasonal HVAC maintenance for Washington County homes. The schedule M&M Mechanical Inc.'s techs use after 30+ years on the job.
10 min read
Resources
HVAC Resources for Southern Utah Homeowners & Businesses
Practical guides from M&M Mechanical Inc.'s techs, written by people who actually do this work.
Family-owned since 1992 Licensed & insured All makes and models Free estimates
Talk to a tech today
Same-day service available across the St. George metro area. Free estimates on installs.
Call (435) 674-1275 Request a Quote Online- › 24/7 emergency dispatch
- › 30+ years of local experience
- › Honest diagnostics
Browse Maintenance Air Conditioning Buying Guides Commercial Indoor Air Quality Heating
Latest article
More guides
All articles
Air Conditioning
Why Your AC Coil Freezes (and How to Prevent It This Summer)
Ice on your AC line in 105° heat? It's a real problem with five common causes. M&M Mechanical Inc. walks through what to check before calling a tech.
8 min read
Read more
Buying Guides
SEER2 Ratings Explained: A Buying Guide for 2026
SEER2, EER2, HSPF2: what the new efficiency ratings actually mean and what's worth paying for in Southern Utah. M&M Mechanical Inc.'s straight-shooting buying guide.
9 min read
Read more
Commercial
The Commercial HVAC Maintenance Checklist (Quarterly + Annual)
Quarterly and annual preventive maintenance tasks for commercial RTUs, splits, and ductwork, built from 30+ years of M&M Mechanical Inc. service tickets.
11 min read
Read more
Indoor Air Quality
Indoor Air Quality in a Desert Climate: What Actually Works
Dust, dry winters, allergens, wildfire smoke: Southern Utah air is rough. The IAQ upgrades that actually help, from M&M Mechanical Inc.
10 min read
Read more
Heating
Geothermal Heating & Cooling in Southern Utah: A Plain-English Guide
How geothermal works, what it costs to install, and whether it pays back in Southern Utah's climate. From M&M Mechanical Inc., geothermal installers since the 90s.
11 min read
Read more
Buying Guides
What Size Air Conditioner Do I Need? (Manual J vs. Square-Foot Rules)
The square-foot rule oversizes most ACs. Here's how M&M Mechanical Inc. actually sizes air conditioners for Southern Utah homes, and why it saves you money.
9 min read
Read more
Heating
Heat Pump vs. Gas Furnace in Southern Utah: Which Wins?
In Southern Utah's mild winters, a heat pump usually beats a gas furnace on cost, comfort, and rebates. Here's the real math from M&M Mechanical Inc.
10 min read
Read more
Air Conditioning
10 Signs Your Air Conditioner Needs Repair (Before It Quits)
Strange noises, weak airflow, surprise bills: the warning signs your AC is failing. Catch them early and save thousands. From M&M Mechanical Inc., Southern Utah HVAC.
9 min read
Read more
Maintenance
How Often Should You Replace Your HVAC Air Filter?
How often to change your home's HVAC air filter, by filter type, household, and Utah climate. Real schedules from M&M Mechanical Inc., Southern Utah HVAC pros.
8 min read
Read more
Have a question we haven't answered?
Call the shop in Washington and a real tech will pick up. We've been answering this number since 1992.