AC Tune-Up & Maintenance
An AC tune-up is a spring service visit aimed at the things that fail in a heat wave: refrigerant charge measured against the nameplate, the run capacitor metered against its rating, both coils cleaned, and the condensate drain proven to flow. Standalone visits run $120–$250.
Air conditioner maintenance comes down to two measurements and two drains, and the measurements are the part a homeowner cannot do. Charge is checked as subcooling on a system with a thermostatic expansion valve, or superheat on a fixed-orifice one, and compared against the figure printed on the unit's data plate. A reading a couple of degrees off nameplate means the charge is drifting, which almost always means a slow leak — found in May that is a repair, and found in a July heat wave it is a compressor that has been running hot for six weeks.
The run capacitor is the most common failure on a residential air conditioner and the only one we can genuinely see coming. A capacitor rated at 45 microfarads that meters at 38 will still start the compressor on a mild morning and drop it on the first 32°C afternoon. We put a meter on it every visit and put the reading on the invoice, so a weak one becomes a $150–$350 part swapped during a scheduled visit instead of an emergency call on the hottest weekend of the year.
Then the drains. A cooling system pulls litres of water out of the air each humid day, and that water has to reach a floor drain or a pump — the trap and line grow algae, back up, and either shut the system down on a float switch or find your ceiling. In the larger 2000s builds around Binbrook and the newer Ancaster subdivisions, where a second air handler sits in an upstairs mechanical closet, the float switch in that pan is the only thing between a plugged drain and drywall damage, and it needs testing rather than assuming. Outside, the condenser coil spends May and June collecting cottonwood fluff, grass clippings and dryer lint; a matted coil raises head pressure and quietly costs efficiency all season.
Timing is practical rather than fussy: we book cooling visits from mid-April, because refrigerant charge cannot be read accurately until the outdoor temperature is above roughly 15°C, and we want the work done before the first properly humid stretch pushes in off Lake Ontario — humidity is what the shoreline strip from Bronte to Aldershot actually struggles with, as lakefront humidity and AC sizing explains. Book a standalone visit through our contact page, or bundle it with the fall furnace visit on a maintenance plan.
What a spring AC tune-up covers
- Refrigerant charge measured as subcooling or superheat and compared to the data plate figure
- Run capacitor and contactor metered, and compressor start and run amps checked against the rating
- Outdoor condenser coil washed from the inside out; indoor coil and blower wheel inspected for dust loading
- Condensate pan, trap, drain line and float switch flushed and proven to drain
- Temperature split across the indoor coil, filter, thermostat cycle and electrical terminations checked and torqued
How it works
Tell us the unit's age and where the indoor coil sits. Cooling slots fill quickly once the first warm week arrives, and charge cannot be verified in March cold.
Charge, amps, capacitance, coil condition, drain flow and temperature split — in that order, with the system running through a full cycle.
You get the readings written down, so next spring's technician can see whether anything has moved rather than starting from scratch.
Brands: We maintain every residential cooling brand we install and plenty we do not — Lennox, Carrier, Trane, Goodman, Rheem, Daikin, York, Amana and KeepRite — including builder-installed condensers still under warranty.
Common questions
How often should an air conditioner be serviced?
Once a year, in spring, for a system used every summer. A heat pump that runs in both seasons needs more attention than that. How often an air conditioner should be serviced covers what changes with age and usage.
Does a tune-up include topping up the refrigerant?
No, and be wary of anyone who offers it as a routine item. Air conditioning is a sealed system: it does not consume refrigerant, so if it is low it is leaking, and adding gas without finding the leak just pays for the same repair twice.
Is a tune-up worth it on a nearly new unit?
Yes, for two reasons. Manufacturers commonly require documented annual maintenance for parts coverage to stand, and a new system that was commissioned in a hurry is exactly where an off-nameplate charge shows up. Understanding HVAC warranty coverage explains what documentation is usually needed.
Can I clean the outdoor coil myself?
Yes, carefully. Pull the disconnect beside the unit first, then rinse with a garden hose from the inside of the coil outward so debris is pushed back out the way it came. Never use a pressure washer — the fins bend flat and the coil ends up worse than when you started. Our spring AC startup checklist has the rest of the homeowner list.
What does maintenance cost over a year?
Booked one at a time, the spring cooling visit and the autumn heating visit come to $240–$500 between them. A plan covering both is $150–$350 a year, so the arithmetic usually favours the plan before you count the priority scheduling that comes with it in the weeks when every furnace or condenser in the city quits at once. How much AC maintenance costs compares the options.