No cold air? We’ll get you comfortable today
Same-day diagnostics get you on the schedule fast. If you call early, we can usually hold a window the same afternoon.
Emergency service runs nights and weekends when the heat won’t wait.
We show up ready for the common stuff: failed capacitors, weak blower motors, low charge, and clogged drain lines. You get clear findings, options, and a straight recommendation before any work starts.
Common AC problems we fix in Upton, MA
Warm air
- Warm supply air supply: low refrigerant from a refrigerant leak, failed capacitor on the condenser fan, dirty filter, or thermostat settings out of whack.
Short cycling
- System starts and stops every few minutes: restricted airflow, iced evaporator coil, oversized equipment, or a failing pressure switch.
Frozen coil
- Ice on the evaporator coil: dirty filter, weak blower motor, low airflow across the coil, or low charge from a slow leak.
Water around the air handler
- Puddle by the indoor unit: clogged drain line, cracked pan, or heavy late-July humidity near Upton State Forest overwhelming a dirty coil.
Breaker trips
- Breaker trips as the condenser starts: hard-start compressor, shorted wiring at the condenser, or a failing contactor/capacitor.
How our air conditioning repair service works
- Arrival & listen. We ask what you’re seeing and when it started. Quick walkthrough of thermostat, air handler, and outdoor unit.
- Safety & power checks. Verify breakers, disconnects, and line voltage. Inspect wiring, contactor, capacitor, and fuses.
- Airflow & refrigerant checks. Measure static pressure, temperature split, and superheat/subcool for proper charge.
- Pinpoint the fault. Test compressor and fan amps, blower motor, control board, and sensors. Clear the drain line if it’s plugged.
- Quote & approval. You get findings plus options. We explain parts, timelines, and what drives cost (parts availability, refrigerant type, and system condition).
- Fix & verify. Install parts, correct charge, and run a full test. We clean up, set thermostat schedules, and share simple maintenance tips.
Emergency & same-day availability
Phones are live Mon–Sat 7am–7pm with 24/7 emergency dispatch. Same-day booking is first-come, first-served with best availability before 2pm.
We cover roughly a 25-mile radius along Route 140 and across Worcester County, so you’re never far from help.
Call (508) 310-0955
Discuss your project with our experts and receive a same-day estimate window, so you’ll know exactly what to expect before we begin.
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Why homeowners in Upton choose Centerline Mechanical LLC
- 10+ years local experience. Familiar with Worcester County homes, duct layouts, and code requirements.
- Licensed & accountable. MA HVACR #11040, insured, and background-checked technicians.
- Stocked service vans. Common capacitors, contactors, motors, and control parts onboard to speed repairs.
- Clear communication. Photo/video findings and plain, no-hype recommendations you can trust.
- Real availability. Same-day options and true 24/7 emergency response when heat spikes.
Brands we service
Carrier, Trane, Lennox, Goodman, Rheem, Ruud, York, Bryant, American Standard, Payne, Heil, Amana, Day & Night, Mitsubishi Electric (mini-split), Daikin, LG, Fujitsu, and most heat pump and mini-split systems.
Service area
Based in Upton and serving nearby Hopkinton, Milford, Grafton, Mendon, and Northbridge. If you’re in Worcester County and along Route 140, we can usually get to you the same day.
Maintenance to prevent the next breakdown
A clean coil and open drain keep humidity in check and stop surprise shutdowns. We check electrical connections, test the capacitor and compressor amps, wash the condenser, and verify refrigerant performance so the evaporator coil doesn’t ice over.
If you want hands-off upkeep, our Maintenance plans handle seasonal tune-ups and priority scheduling. That way the blower motor stays healthy, airflow stays strong, and energy use stays predictable.
FAQs
On most days, we can offer a same-day diagnostic if you call by early afternoon. During heat waves, we extend hours and open an emergency queue for after-hours calls.
We service most major brands, plus heat pumps and mini-splits. If you’re running a ductless system or a variable-speed condenser, we’ll match the right parts and commissioning steps. Need something beyond repair? Our team can quote AC installation with proper sizing.
Older R-22 systems are costly to recharge and difficult to support due to phase-out. We’ll locate any refrigerant leak, explain repair options, and compare them with replacement. Any refrigerant handling is done by EPA Section 608–certified technicians for safety and compliance.
We look at age, repair history, compressor condition, parts availability, and efficiency. If a major component is failing on a 12- to 15-year-old system, replacement can make more sense. If the fix is a capacitor, contactor, or drain issue, repair is usually the smarter move. If you’re moving toward a heat pump, we also handle Heat pump repair and can map out the switch when the time’s right.
