What you can check yourself
Look at the outdoor unit. Clear away any leaves, ice or debris stacked against it so air can move through the coil. Check the air filter inside and swap it if it's gray with dust, a clogged filter starves the system and makes it look like a bigger problem than it is. Look at the thermostat setting and batteries if it has them. Check that the breaker for the outdoor unit hasn't tripped. These take a few minutes and rule out the simple causes before anything else gets blamed.







