How to Add Freon to Your AC Unit

Freon is a refrigerant that’s used in AC units to help remove heat from the air and allow cool air to be dispensed into the house. Oftentimes this Freon can leak out of the unit which will cause your cooling system to dispense room temperature air. In order for your AC unit to work properly again, you’ll need to fix the leak and replenish the supply of Freon.

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Step 1: Identify Problem & Gather Supplies

First, you want to make sure a Freon leak is the problem with your AC unit. Units made before the year 2010 use refrigerants, while newer units do not. If yours is made before this cutoff year and you’ve ruled out broken parts or serious duct leaks, proceed with purchasing the corresponding Freon repair kit for that specific unit.

Step 2: Find the Leak

Turn off the AC system and put on your goggles and breathing mask before you begin (for your own safety). Since Freon doesn’t evaporate, if the refrigerant levels are low, a leak exists. Attach the temperature and pressure gauges from your Freon repair kit and measure the temperature and pressure of each line. Whichever line has a pressure of less than 65 psi and a temperature higher than 45 degrees Fahrenheit, is the one with the leak.

Step 3: Attach the Repair Kit

Open up the outdoor AC unit and locate the two compressor lines. Follow the instructions carefully on your repair kit and connect the injection hose and can of sealant to the appropriate compressor lines. Next, turn on the power to the AC unit and open up the can of sealant to allow it to spread throughout the lines. Allow this sealant to run through the lines for at least a full minute so it can thoroughly patch up the leaky areas.

Step 4: Add the Freon

As you follow your instructions, reconnect the pressure and temperature gauges to the appropriate lines, along with your container of refrigerant. Once connected, release a small amount of Freon into the system (keep the Freon container upright). Wait 10 minutes and add another small amount. Do this in increments of 10 minutes so you can see if the gauges are moving due to the addition of Freon. Once the gauges are reading the normal levels, turn on the AC unit and test the system. (If cool air still isn’t coming out, contact your local air conditioning company.)

When your cooling system isn’t blowing out cool air, you might have a coolant leak that needs to be repaired and refilled. If you’d rather leave this cooling system repair to the pros, contact Airtech of Stamford. To learn more or to schedule an appointment, give us a call at (203) 323-3959.

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