HVAC maintenance in St. George

Why equipment here gets dirty faster

This is the northeastern edge of the Mojave. The air carries fine mineral dust most of the year, spring wind events push a lot more of it, and a condenser sitting outside is pulling all of it across the coil every time it runs. On top of that, sustained construction on the Washington Fields side means graded dirt upwind of a lot of houses.

Two practical consequences. First, a dirty outdoor coil cannot reject heat, so the system runs longer and hotter for the same cooling — on a 109°F design day that is the difference between keeping up and not. Second, filters load faster here than the interval printed on the box assumes, and a loaded filter starves airflow across the indoor coil, which is a common route to a frozen coil and a system that blows warm.

Check the filter monthly through the cooling season rather than trusting the number on the packaging, and follow the equipment manufacturer's guidance for your specific system. If you can hold it up to a light and not see light through it, it is past due.

Book service before the season, not during it

Cooling service is worth having done in spring, before the first sustained hot stretch and before every contractor in the county is booked solid on emergency calls. Heating service belongs in autumn, before the first cold night finds the problem for you.

The scheduling reason is as good as the technical one. A system checked in March gets an unhurried visit. The same system failing in July competes with everyone else's failure, and you take whatever slot exists.

What you can do, and what needs a licence

Yours

• Check the filter monthly through the cooling season and change it on condition rather than on the calendar. Follow your equipment manufacturer's guidance for the specific system.
• Keep plants, fencing and stored items back from the outdoor unit so it can breathe.
• Rinse loose surface dust off the outdoor coil fins with a gentle hose — power off at the disconnect first, and never a pressure washer, which folds the fins flat and makes the problem permanent.
• Keep supply and return vents clear of furniture and rugs.
• Watch the condensate drain for standing water.

Theirs

• Refrigerant charge measurement and any refrigerant handling — a licensed and EPA-certified job, and the single most commonly botched item in the trade.
• Deep coil cleaning, indoor and out.
• Electrical testing: capacitors, contactors, amp draw against nameplate.
• Blower and duct static pressure checks.
• On the heating side, combustion analysis, heat exchanger inspection and venting.

Beware of anyone who "tops off" refrigerant annually without finding a leak. A sealed system does not consume refrigerant. If it needs more every year, it has a leak, and adding gas to it is selling you the same problem repeatedly.

How to check the contractor's licence yourself

Utah licenses heating and cooling contractors through the Department of Commerce, Division of Professional Licensing. The classification to look for is H100 — HVAC. DOPL's current contractor classification list no longer carries the older S350 HVAC specialty; new HVAC applications moved to H100, with the updated application requirements taking effect 20 April 2026.

Under the current requirements an H100 applicant has to complete a 25-hour pre-licensure course, pass the H100 written trade exam, and document 4,000 hours of qualified HVAC employment within the past five years using W-2s, K-1s or tax returns. DOPL also sets general liability insurance minimums for the classification, and a fingerprint-based background check requirement begins 1 January 2027.

You do not have to take anyone's word for it, including ours. Utah publishes a free licence lookup: secure.utah.gov/llv. Search the business name before work starts.