Is your air conditioner blowing hot air? Do you want it to blow cold air but don’t know how?
An air conditioner blowing hot air is a common problem. There are a couple reasons why this might happen and you might even be able to fix it yourself.
1. Is your thermostat set to heat or is the fan set to on?
This may seem crazy but check your thermostat first. Someone in your house may have turned it to heat. Spouses and kids do crazy things.
Also, check your fan mode. If your fan is set to “on”, it will never turn off. Your air conditioner will turn off, but your fan will continue to cycle air through your home. This will cause warm air to come out of the vents when your air conditioner is not on.
If your fan is always running, all you have to do is set it to “auto” to fix this problem. This will make sure the fan only turns on when the air conditioner is on.
2. Is your condenser unit dirty or is the air flow blocked?
If you remember from the “What is an HVAC System” article, you will remember that your condenser unit cools the refrigerant in your system. To do this, it needs plenty of air flow. If your condenser unit is dirty cool the refrigerant efficiently.
If you have a lot of bent fins or if you have plant life, solid fences, sheds, or other structures too close to your condenser, the air flow is being restricted. This could also be preventing your air conditioner from operating properly.
Fixing this is not that difficult. If your condenser is dirty, clean all the debris from around it and wash it off with a hose.
If the fins are bent, you can use a fin comb to straighten them again.
If the air flow is restricted by trees and bushes, trim them. If buildings or structures are too close, move them.
3. Is it an electrical problem?
Check your fuse box. Is the circuit breaker for your air conditioner tripped? If it is, flip it back on.
Check the disconnect outside. It is located near your condenser unit. Make sure it is turned on.
4. Are your evaporator coils dirty?
Your evaporator coils are where the magic happens in your air conditioning system. If they are dirty, your air conditioner will not be able to transfer the heat from the air in your home to the refrigerant.
If your evaporator coils are dirty, you will have to call a professional to clean them. They are inside your system and I don’t recommend taking that apart on your own.
5. Is your refrigerant low?
If your refrigerant is low, it can’t effectively transfer heat. There is not much you can do about this. You will need to call a professional to check your refrigerant level and add more if needed.
If your air conditioner is blowing hot air and you are not sure how to diagnose it, call a professional. It is a good idea to spend a little money for a professional to prevent permanent damage to your HVAC system.