Why is my AC blowing warm air after a power outage?

Your AC is likely blowing warm air because the power outage disrupted your system's normal operation, with the most common cause being a tripped circuit breaker or blown fuse.

After a power outage, several components in your air conditioning system may need to be reset or checked. The outdoor condenser unit often has its own dedicated circuit breaker that may have tripped during the power surge when electricity was restored. Additionally, your indoor air handler or furnace (which contains the blower fan) may also be on a separate breaker that tripped. When these breakers trip, your system might still run partially - the indoor fan could blow air, but without the outdoor unit running, that air won't be cooled.

Check your electrical panel first and look for any tripped breakers related to your HVAC system. Tripped breakers will be in the middle position between "on" and "off." Reset them by pushing fully to "off" then back to "on." Many AC systems also have a disconnect switch near the outdoor unit that may have been accidentally turned off during the outage.

In Ottawa's electrical systems, power surges during outages can also damage sensitive components like capacitors, contactors, or even the thermostat. If resetting breakers doesn't solve the problem within 30 minutes of operation, there may be internal damage that requires professional diagnosis. Never attempt to open electrical panels on the outdoor unit yourself - this work requires licensed technicians due to high voltage hazards.

Some systems also have built-in safety delays after power restoration, so wait at least 5-10 minutes after resetting breakers before expecting cool air. If your system still blows warm air after checking these basics, contact Ottawa HVAC Pro for a diagnostic service call to identify any surge-related damage and get your cooling restored safely.