The most common commercial repairs cluster around five areas: refrigerant leaks, control and thermostat faults, belt and motor failures, clogged condensate systems, and stuck economizers. Nearly all of them are progressive problems that were findable months before they caused a failure.
Refrigerant Leaks
Refrigerant is not consumed. A system that is low has a leak, and topping it off without finding the source is a temporary measure that guarantees a return visit.
Commercial systems leak more often than residential ones because there is simply more of everything — longer line runs, more joints, more vibration from larger compressors, and rooftop equipment exposed to constant thermal cycling and weather.
The symptom is reduced cooling capacity, which in a commercial space often gets reported as “it just cannot keep up on hot afternoons” rather than as a failure. Left alone, low charge causes the compressor to run hot and eventually destroys it — turning a leak repair into a compressor replacement.
Control and Thermostat Faults
A large share of commercial service calls turn out to be controls rather than mechanical failure.
Programming drifts or was never set correctly. Schedules do not match actual operating hours, so the building conditions itself overnight or fails to precondition before opening. Sensors fail or fall out of calibration. Zone controls and dampers stick.
These present as comfort complaints — one area too warm, another too cold — and get diagnosed as equipment problems when the equipment is fine.
Belts, Bearings, and Motors
Commercial air handling equipment uses belt-driven blowers that residential systems generally do not.
Belts stretch, glaze, and slip, which quietly reduces airflow before it produces any noise. Bearings dry out and fail. Motors accumulate far more runtime hours than residential equipment ever does, and amp draw climbs as they degrade.
These are inspection items. A belt checked twice a year almost never strands a building; a belt nobody has looked at in three years does.
Condensate Problems
Commercial systems remove a great deal of moisture, and that water has to drain. Biological growth blocks the line, the pan overflows, and on a rooftop unit that water goes into the building.
Ceiling damage from a clogged condensate line is one of the most common — and most preventable — commercial HVAC losses. Units with float switches shut down instead, which means a cooling outage during business hours rather than water damage. Neither is a good morning.
Economizer Failures
Economizers bring in outside air when conditions allow, cutting compressor runtime substantially. They are also mechanical assemblies exposed to weather, and they fail constantly.
The insidious part is that a stuck economizer produces no complaint. If it fails closed, you lose the savings and nobody notices. If it fails open, the unit pulls hot outside air in during peak cooling and the compressor runs continuously against it — a large, invisible increase in energy cost.
Nobody finds this except during service.
Rooftop Unit Wear
Rooftop equipment sits fully exposed to Hill Country sun, wind, dust, and hail. Cabinet corrosion, damaged access panels, failed weather seals, and coils packed with debris are routine findings.
Coils in particular matter. A condenser coil that cannot reject heat forces the compressor to work against elevated head pressure all season, which costs both efficiency and equipment life.
Why These Repeat
Almost everything above is progressive. It develops over months, produces no obvious symptom, and then causes a failure at the worst possible time — during peak load, which is also when you can least afford to close.
That is the argument for scheduled service rather than reactive repair. Details are on our commercial HVAC services page, and our maintenance plans cover commercial properties on intervals set by building type.
When You Need a Repair Now
We respond to commercial calls throughout Fredericksburg, Kerrville, Boerne, Comfort, and the Hill Country, and we schedule around your operating hours wherever the situation allows.
Because we also provide commercial plumbing, issues that cross trades — condensate routing, gas supply, make-up water — get handled on one visit. Ductwork and airflow problems are diagnosed at the same time rather than referred out.
Contact 72 Degrees or call (830) 468-5316.
