What to Know About Allied Air Enterprises Air Conditioning Units

Allied Air Enterprises makes residential and light commercial air conditioning systems sold under several brand names

Allied Air Enterprises is a manufacturer owned by Lennox International that produces air conditioning equipment for homes and small businesses. You may own one of their units without knowing the parent company name — they sell under brand names including Comfortmaker, Heil, Keeprite, and Arcoaire. If you have one of these units, understanding the manufacturer behind it helps you find the right parts, manuals, and service support.

The company has been in business since the 1950s and operates manufacturing facilities across North America. Their product line includes central air conditioning systems, heat pumps, and air handlers that work with furnaces and other heating equipment. Most residential units are split systems, meaning the compressor and condenser sit outside while the air handler lives inside your home.

Key Takeaways

• Allied Air Enterprises manufactures air conditioning systems sold under the brand names Comfortmaker, Heil, Keeprite, and Arcoaire, so you may own one without recognizing the parent company name.
• Your unit's model and serial number, printed on a metal plate attached to the outdoor condenser, are the first things you need to locate any manual or parts information.
• Lennox International owns Allied Air Enterprises, which means some parts and service information flow through Lennox channels even if your unit carries a different brand name.
• Refrigerant type and capacity vary by model year and unit size, so checking your documentation before adding refrigerant or hiring service prevents damage and safety risks.

How to identify your Allied Air unit and find its manual

Look for a metal nameplate on the outdoor condenser unit — this is the large box sitting outside your home. The plate shows the brand name (Comfortmaker, Heil, Keeprite, or Arcoaire), the model number, and the serial number. Write these down or take a photo. The model and serial number are your key to finding the correct manual and parts list.

Visit the brand-specific website for your unit. Comfortmaker, Heil, Keeprite, and Arcoaire each maintain their own support pages where you can search by model number. If the brand website does not have the manual, contact Lennox directly — they can often provide documentation even for older units. Keep the manual in a safe place near your thermostat or in a folder with other home maintenance records. The manual tells you the refrigerant type, capacity, electrical requirements, and filter size, all of which matter for maintenance and repairs.

Refrigerant types and what changed over time

Older Allied Air units from the 1990s and early 2000s used R-22 refrigerant (also called Freon). Newer units use R-410A or R-32, which are more environmentally friendly. The type matters because you cannot mix refrigerants, and using the wrong one damages the compressor and voids the warranty. Your manual and the nameplate on the condenser both list the correct refrigerant.

R-22 is being phased out — production stopped in the United States in 2020, and the EPA restricts its use. If your unit uses R-22 and needs a refrigerant charge, the cost is higher than it was ten years ago because supply is limited. This is one reason many homeowners with older R-22 systems choose to replace the entire unit rather than repair it. R-410A and R-32 units are standard now and will be easier and cheaper to service for the next decade.

Maintenance tasks you can do yourself

The most important task is replacing or cleaning the indoor air filter every one to three months, depending on dust, pets, and allergies in your home. The filter size is listed in your manual — common sizes are 16×25×1, 20×25×1, or 16×25×4. A clogged filter reduces cooling efficiency, makes the system work harder, and can freeze the evaporator coil if left too long. Keep spare filters on hand so you do not skip a change because you do not have a replacement.

Inspect the outdoor condenser unit twice a year — once before cooling season and once after. Clear away leaves, grass clippings, and debris from around the unit. Keep at least two feet of clearance on all sides so air can flow freely. If the fins (the thin metal blades on the sides) are bent, you can carefully straighten them with a fin comb, a tool available at hardware stores for under twenty dollars. Do not use a pressure washer on the fins — the force can bend them further. A garden hose on low pressure is safe.

When to call a service technician

Contact a licensed HVAC technician if the unit is not cooling, is making unusual noises, is leaking water indoors, or is leaking refrigerant (you will see oil stains on the outdoor unit). Do not attempt to add refrigerant yourself — this requires special equipment, a license in most states, and knowledge of the correct charge amount for your specific unit. Overcharging or undercharging reduces efficiency and can damage the compressor.

If your unit is still under warranty, check the documentation before calling a technician. Some warranties require you to use an authorized dealer or a licensed professional, and using someone else may void coverage. Allied Air units typically come with a five-year parts warranty and a ten-year compressor warranty if registered with the manufacturer. Registration is usually done by the installer, but you can verify this by contacting the brand's customer service with your serial number.

Storing your unit information for future reference

Create a simple record with the brand name, model number, serial number, installation date, and refrigerant type. Store it in a folder with your other home maintenance documents — your furnace manual, water heater information, and electrical panel details. If you ever sell the home, this folder becomes part of the disclosure to the new owner and proves you maintained the system.

Take a photo of the nameplate on the outdoor unit and save it to your phone or cloud storage. If you need to call a technician or order parts while away from home, you will have the information instantly. Many homeowners lose this information after a few years and regret it when they need service. A five-minute investment now saves frustration later.

Frequently Asked Questions

How do I know if my unit is made by Allied Air Enterprises?

Check the brand name on the outdoor condenser nameplate. If it says Comfortmaker, Heil, Keeprite, or Arcoaire, it is made by Allied Air Enterprises. You can also contact the brand's customer service with your model number and they will confirm the manufacturer.

Can I use a different brand's parts in my Allied Air unit?

Some parts like filters and capacitors are universal and work across brands. However, compressors, coils, and refrigerant-specific parts must match your exact model. Always check your manual or call the manufacturer before ordering parts. Using incompatible parts can damage the system and void the warranty.

What should I do if my unit stops cooling in the middle of summer?

Turn off the system and call a licensed HVAC technician. Do not try to restart it repeatedly — this can damage the compressor. While waiting for service, use fans and close blinds to keep your home cooler. If the unit is under warranty, contact the brand's customer service to confirm coverage before the technician arrives.

How long do Allied Air units typically last?

Most residential air conditioning systems last 15 to 20 years with regular maintenance. Replacing the filter, keeping the outdoor unit clear, and having it serviced annually extends the lifespan. If your unit is over 15 years old and needs a major repair, it may be more cost-effective to replace it than to repair it.

Where can I buy replacement parts for my Allied Air unit?

Contact the brand's customer service line with your model number — they can direct you to authorized parts dealers. You can also search online for the specific part number, but verify it matches your model before ordering. Some parts require a technician to install, so confirm whether you need professional help before purchasing.