Why is my AC blowing hot air?

Before you call a professional to look at an indoor unit, check for a few basic things. Sometimes fixing the problem is as easy as checking your thermostat.
This is your air conditioning unit’s control center. Check to see that your temperature is set below the current air temperature, and lower it if need be.
Of course, if it’s set to “heat,” you won’t get any air conditioning at all. If you have a zoned system, be sure to check both thermostats. A conflicting setting in one area of the house can affect overall function.
While you’re at it, check the fan setting. Make sure your thermostat is set to “auto” and not “on,” as the “on” setting will make the fan run continuously and circulate air regardless of its temperature. 
Sometimes it’s common to turn the fan on to bring in some fresh air, only to forget about it. A continuously running fan can offset the indoor temperature you feel coming from the vents.
Also, the batteries may need to be replaced in the thermostat itself. (This doesn’t go for all models, but if it applies, it’s an easy fix.)
If this doesn’t fix the problem, your thermostat might be malfunctioning. Your Diamond Blue technician can troubleshoot your thermostat and determine if it needs to be replaced.

Need Help?
The fixes in this section are all things you can check on yourself. If these don’t solve the problem or go beyond your comfort level, give us a call for fast air conditioning repair in Lansing MI or the surrounding Michigan areas.

#1 We will check for possible wiring problems or shorts in the thermostat or other underlying issues in your inside and outside unit.

#2 Tripped Breaker or Electrical Surge
Are there any breaker switches that were tripped? Obviously, if your AC is not running at all your first concern wouldn’t be warm air. However, it’s possible part of the system, such as the outdoor condensing unit, is powered off.
Take a look at the circuit box. (This is often in the garage, but not always.)
If it has tripped, simply flip it back and check the air temp again. If it continues to trip, it is a sign of something else going on inside the system that needs attention. Give us a call for a diagnosis.

#3  A Clogged Line and Water Build up 
Every air conditioner produces water as a byproduct of conditioning the warm air, so it has a drain system to get rid of it. If the hose or condensate line is clogged, it can cause problems and can potentially leak water. 
Most units have a safety mechanism and it can cause the AC compressor to shut down. This problem can be prevented by scheduling regular air conditioning maintenance visits to keep your lines clean and the system running at peak efficiency. 

#4 Dirty Air Filters
Every bit of air that travels out of your air conditioner is first run through the air filters. A dirty air filter doesn’t seem like a huge problem, but it leads to far bigger issues. If the airflow becomes restricted due to dirty or clogged filters, it can cause the motor, fan, or compressor to overcompensate and even cause the system to shut off.
Eventually, your AC system can freeze up. A clean air filter is an easy and inexpensive way to ensure you are not restricting airflow, which will help your system perform at optimal levels.
If left unattended, the dirty air can begin to affect the evaporator coil. A dirty evaporator coil won’t allow your system to cool like it should, and is sometimes related to dirty filters.
Changing air filters should be done regularly. We can assist you in determining the best practices for your home and system during regular maintenance visits. 

#5 Low Refrigerant Levels
Refrigerant is the agent that facilitates the heat-cold exchange, so when levels are low your air conditioner will start cooling less. This is one common reason why your AC unit isn't as cool as it should be.
When your air conditioner’s evaporator coil becomes dirty or has a leak, it will struggle to transfer heat from your home. This can result in a less comfortable home, higher electrical bills and may even shorten the life span of your air conditioner. This can usually be taken care of during routine air conditioning maintenance to help you avoid this issue.
Slow leaks from the lines that carry the refrigerant can cause levels to drop. Your coil might also have a refrigerant leak and can be checked with the right instrumentation. Low-level leaks can eventually cause damage to all parts of the air conditioner or heat pump, as the machinery will work harder to compensate for the loss. 
Recharging the refrigerant is a job that is best left to HVAC professionals. Finding and fixing the leak is a specialized job that requires a lot of know-how. An inferior DIY job will cause continued issues and further damage to the mechanism. Not to mention, most homeowners don’t have the proper access to R-22 or R-410A refrigerant or the equipment to safely do this. Checking and maintaining proper levels can easily be done when it's time to service your air conditioner, both in Spring or Fall.
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#6 Restricted or Malfunctioning Compressor 
The compressor’s job is to compress the refrigerant that keeps the cooling evaporator coil cold. Therefore, if the condenser coil is not working at full capacity to expel the hot air outside, the cooling coil will not be as cold as it needs to be to decrease the indoor air temperature.
In general, there are a variety of things that can go wrong with compressors, the simplest of which are dirty condenser coils. You might initially notice that it’s simply not turning on like it should be, which will signal a problem.
A build-up of dirt and debris such as leaves on the outdoor unit is very common and often overlooked by homeowners while cutting grass every week. This is one of the first things an HVAC professional will check for. 
Any compressor repair or replacement jobs should only be completed by a licensed HVAC  professional