Complete Air Conditioner Guide FAQ

Have questions about your central air conditioner? Explore expert answers covering AC brands, SEER2 ratings, troubleshooting common cooling issues, and professional maintenance.

1. General Information & Services

We provide professional installation, maintenance, and repair services for most major central air conditioner brands available across Canada, including Goodman, Amana, Lennox, Carrier, Keeprite, Kepler, Trane, American Standard, Rheem, York, Bryant, and more.

No. For safety reasons, we do not service, maintain, or repair AC outdoor units installed in elevated locations that require specialized ladders or scaffolding to access.

Yes. Upon request, we perform full installations for elevated or roof-mounted AC units using proper lifting equipment, safety protocols, and code-compliant practices.

No. Due to limited access, severe spatial constraints, and safety considerations, we do not perform repairs or routine maintenance on air handlers or coil assemblies located in attics.

We evaluate attic replacements on a case-by-case basis during an on-site consultation, but routine repairs and servicing for attic-located air handlers fall outside our service scope.

Yes, all our technicians are fully licensed, certified, and trained in accordance with Canadian environmental and safety standards.

Yes, we offer prompt emergency repairs during peak summer heatwaves to restore cooling comfort to your home as quickly as possible.

Yes, we offer annual preventive maintenance plans that help keep your system running efficiently, reduce energy bills, and prevent sudden summer breakdowns.

Yes, we provide service, installation, and maintenance for both single-family homes and light commercial properties.

We provide cooling services throughout our local region and surrounding communities. Contact our office to confirm coverage for your specific neighborhood.

2. System Operation, SEER & Components

A central AC system works by circulating refrigerant between an indoor coil and an outdoor condenser. The indoor coil absorbs heat and moisture from inside your home, while the outdoor unit releases that heat outside.

A split system divides cooling components into two main parts: an outdoor unit (compressor and fan) and an indoor coil mounted on your furnace or air handler.

SEER stands for Seasonal Energy Efficiency Ratio. It measures how efficiently a central AC operates over an entire cooling season. Higher SEER numbers indicate higher efficiency.

SEER2 is the updated rating standard introduced to measure AC efficiency under higher external static pressure, providing a more accurate reflection of real-world home performance.

New central air conditioners installed in Canada must meet current energy efficiency standards, generally starting at 13.4 SEER2 (equivalent to 14 SEER).

AC capacity is measured in Tons or BTUs (British Thermal Units). One ton of cooling equals 12,000 BTUs per hour.

Sizing depends on your home’s total square footage, insulation quality, window placement, ceiling height, and local climate conditions.

An oversized unit cools the house too quickly without running long enough to pull moisture from the air, resulting in a cold, humid, and uncomfortable home (short-cycling).

An undersized unit will run continuously on hot days without ever reaching the target temperature on your thermostat, leading to high electricity bills.

Single-Stage: Runs at 100% capacity whenever turned on.
Two-Stage: Operates at a lower stage (~65%) for milder days and full power for extreme heat.
Variable-Speed: Continuously adjusts its cooling output across dozens of increments to match real-time indoor needs.

Yes, variable-speed systems offer superior humidity control, quieter operation, more consistent temperatures, and maximum long-term energy savings.

Modern systems use environmentally compliant refrigerants (like R-410A or newer R-454B/R-32). Older R-22 (Freon) has been completely phased out.

No. R-22 and R-410A operate at completely different pressures and use incompatible lubricants. Mixing them will ruin the system.

The indoor evaporator coil sits inside or on top of your furnace/air handler. It absorbs heat and moisture from warm indoor air passing over it.

The outdoor coil wraps around the exterior unit. It expels the thermal energy collected from your house into the outside air.

The compressor is the motor inside the outdoor unit that pumps refrigerant through the system, squeezing gas to raise its pressure and temperature.

A TXV is a metering device that regulates the exact flow of liquid refrigerant into the indoor coil based on cooling demand.

A standard central AC only cools your home. A central heat pump looks almost identical but includes a reversing valve so it can both cool in summer and heat in winter.

With routine seasonal maintenance, a residential central AC unit in Canada typically lasts 12 to 15 years.

No. Central AC systems recirculate, filter, and cool the air already inside your home.

An outdoor safety switch mounted on the wall near the AC condenser that allows technicians to cut power safely during maintenance.

Well-sized ducts ensure balanced airflow, prevent motor strain, keep operating noise low, and allow the system to cool all rooms evenly.

Static pressure is the resistance to airflow inside your ductwork and coils. High static pressure reduces efficiency and accelerates component wear.

Yes. High humidity prevents perspiration from evaporating off your skin, making 24°C feel much hotter and muggier than it is.

Depending on size and run time, a properly sized central AC can remove dozens of liters of moisture from household air daily.

3. Installation, Codes & Sizing

Costs depend on equipment capacity (tonnage), efficiency tier (SEER2), electrical service requirements, line set routing, and ductwork compatibility.

Most standard residential central AC installations are completed in a single day, typically taking 4 to 8 hours.

Not always, but replacing both together ensures fully matched equipment, maximizes energy efficiency, and lowers overall labor costs.

A matched system means the outdoor condenser, indoor coil, and furnace blower are engineered and certified to work together at peak efficiency.

An AHRI certificate verifies that your exact combination of indoor coil, outdoor unit, and furnace blower has been tested to meet rated efficiency standards.

Yes, depending on your municipality and utility provider, high-efficiency cooling systems and heat pumps frequently qualify for green energy rebates.

An outdoor unit needs adequate open space around all sides (typically 18–24 inches) and overhead clearance to ensure proper airflow and technician access.

Yes. Wall-mounting brackets keep the unit elevated off the ground, protecting it from snow accumulation, dirt, and garden equipment.

A composite or concrete pad placed under the outdoor unit to keep it level, ensuring proper compressor oil distribution and quiet operation.

Insulating the suction line prevents the cold returning gas from absorbing attic or outdoor heat and stops water condensation from dripping onto surfaces.

When replacing an older AC while reusing existing copper lines, flushing removes residual oils and debris so new refrigerants stay clean.

No. Central AC requires ductwork. Homes without ducts typically install ductless mini-split systems instead.

It is not recommended. Placing an outdoor unit in a confined space traps hot air, reducing cooling performance and risking equipment overheating.

Most residential central ACs require a dedicated 240V double-pole circuit breaker, typically rated between 20 to 40 amps depending on tonnage.

Yes, most local municipalities require electrical and/or mechanical permits to confirm compliance with safety codes and setback rules.

4. Maintenance & Care

We recommend having your central AC inspected and serviced once a year, ideally in spring before heavy summer use.

A standard maintenance service includes testing electrical contacts, inspecting operating pressures, cleaning coils, clearing drain lines, and verifying fan performance.

Standard 1-inch filters should be changed every 30 to 60 days. Thicker 4-to-5-inch media filters last 6 to 12 months.

A filter rated MERV 8 to 11 provides excellent dust and allergen capture without causing excessive airflow resistance.

A clogged filter restricts airflow over the indoor coil, leading to reduced cooling, higher electricity bills, and potentially freezing the coil solid with ice.

Clear away grass clippings, leaves, and weeds around the unit. You can gently rinse surface dirt off the exterior cabinet using a standard garden hose.

No. Never use a high-pressure washer. The high water pressure will bend the delicate aluminum fins on the coil, permanently blocking airflow.

Hail, flying rocks from lawnmowers, pressure washing, or physical impact can bend fins. Bent fins can be straightened using a specialized fin comb.

As your AC removes moisture from indoor air, water drains out through a PVC pipe. Over time, algae and dust can build up and clog the line.

Pouring a cup of plain white vinegar down the drain line access tee periodically helps prevent algae growth and keeps water flowing freely.

A safety switch installed on the drain pan or line that automatically shuts down the AC if water backs up, preventing ceiling and floor water damage.

Covering the top of the unit protects it from falling ice and snow buildup. Avoid wrapping the sides completely down to the ground to prevent moisture trapping.

No. An AC cools at a constant rate. Setting the thermostat down to 60°F (15°C) will not cool the house faster; it only causes the unit to run longer.

A recommended balance between energy efficiency and indoor comfort is 22°C to 24°C (72°F to 75°F) when home, and slightly higher when away.

Set it to "AUTO". Setting it to "ON" keeps the fan blowing constantly, which re-evaporates moisture off the wet indoor coil back into your living space.

5. Troubleshooting & Common Issues

Warm air can be caused by a dirty air filter, a tripped circuit breaker, an incorrect thermostat setting, a dirty outdoor coil, or low refrigerant.

AC freezing is typically caused by restricted airflow (dirty air filter, blocked return vents, failed blower) or low refrigerant levels due to a leak.

Turn your thermostat cooling setting OFF and set the fan setting to ON to thaw the ice. Replace your air filter and call for technical service.

Thawing a frozen coil typically takes 2 to 6 hours. Do not run the AC in cooling mode while ice remains, as it can damage the compressor.

Short-cycling can be caused by an oversized unit, a severely clogged filter, a faulty thermostat, or tripping safety switches.

Common causes include a failed indoor blower motor, a blown control board fuse, a failed start capacitor, or a broken fan belt on older systems.

Causes include a tripped outdoor disconnect switch, a tripped breaker, an open high-pressure switch, or a defective outdoor contactor/relay.

A capacitor stores energy to start and run the compressor and fan motors. When it fails, the motors may hum without spinning or fail to start altogether.

The contactor is an electrical switch in the outdoor unit that engages high-voltage power when cooling is called for. Over time, electrical pitting or bugs can cause it to fail.

A failing fan motor, a blown capacitor, debris caught in the fan blades, or damaged wiring will prevent the fan from spinning properly.

Breakers trip due to electrical overloads, shorted wiring, a failing compressor pulling excessive amps, or sudden utility power surges.

A loud humming sound indicates power is reaching the outdoor unit, but a component (like a motor or compressor) is unable to start, often due to a bad capacitor.

Squealing noises can signal high internal operating pressures or failing motor shaft bearings. Turn the system off and request technical service.

Rattling can be caused by loose hardware, fan blades hitting debris, a vibrating housing panel, or internal compressor wear.

Water leakage is usually caused by a clogged condensate drain line, a cracked drain pan, or melting ice from a frozen indoor coil.

Vibration rubbing holes in copper lines, corrosion on coil welds, or worn service valves can cause tiny refrigerant leaks over time.

No. Topping up refrigerant without repairing the leak causes recurring performance drops, wastes money, and violates environmental service practices.

A musty smell ("dirty sock syndrome") is caused by bacterial buildup or standing moisture on the indoor coil or drain pan. Professional cleaning eliminates it.

A burning smell indicates electrical wiring overheating or a motor winding failing. Turn off power at the main electrical panel immediately.

• Check that the thermostat is set to COOL and set below room temperature.
• Inspect your electrical panel for tripped circuit breakers.
• Ensure your air filter is clean.
• Confirm the outdoor disconnect switch is inserted.