Date: July 6, 2026
It can be unnerving when your HVAC equipment isn’t working the way it should, especially during a stretch of hot, humid summer weather. With plenty of toasty days across Greater Boston, dependable air conditioning is essential for keeping your home comfortable. If your vents are blowing warm air instead of cool air, you may need an A/C repair. Before scheduling a service call with Cubby Oil & Energy, try these simple troubleshooting steps. You might be able to solve the problem yourself and save the cost of a visit.
Thermostat settings are one of the most common causes of cooling complaints. Make sure the system is set to “Cool” rather than “Heat” or “Fan Only.” Then lower the temperature setting a few degrees below the current room temperature to confirm the air conditioner is running.
If your thermostat uses batteries, replacing them may also restore normal operation.
A dirty filter can restrict airflow enough to make your central A/C seem like it isn’t cooling at all. Excess dust and debris force the system to work harder while reducing the amount of conditioned air reaching your living spaces.
Check the filter near your furnace or air handler once a month and replace it if it looks clogged. In most homes, installing a fresh filter every one to three months helps maintain efficiency and reliable performance.
If your equipment won’t start or suddenly stops cooling, the issue may be electrical rather than mechanical.
Take a look at your home’s breaker panel to see if the A/C circuit has tripped. You should also verify that any service switches connected to the indoor or outdoor equipment remain in the “on” position. Restoring power may be all that’s needed to get cool air flowing again.
Your outdoor condenser unit needs room to release heat effectively. Leaves, weeds, grass clippings and other debris can interfere with airflow and reduce cooling performance.
Turn off the power to the unit before gently removing debris and rinsing the exterior coils with a garden hose. Keeping at least a couple of feet of open space around the condenser can help your system operate more efficiently throughout the cooling season.
If you notice ice on refrigerant lines or reduced airflow from your vents, the evaporator coil may have frozen. Frozen coils can result from restricted airflow or other mechanical issues and prevent your system from cooling properly.
Should this happen, turn the air conditioner off and allow it to thaw rather than continuing to run it. Operating the equipment while this coil is frozen can lead to more extensive damage.
Air conditioners depend on refrigerant to transfer heat from inside your home to the outdoors. If a leak develops, you may experience weak cooling, extended run times or rising electric bills.
Because refrigerant systems require specialized tools and certified handling, diagnosing and repairing leaks is a job for trained HVAC technicians.
If you’ve checked the basics and your central A/C still isn’t delivering cold air, it’s time to bring in an expert. Cubby’s experienced technicians can diagnose everything from electrical faults and frozen coils to refrigerant leaks and worn components. We also provide professional A/C maintenance to help improve efficiency and reduce the risk of future breakdowns.
Whether you need a fast repair or seasonal service, Cubby is ready to help Greater Boston homeowners stay comfortable through the hottest days of summer. Contact us to request service.