Air Conditioning


Miller's Area Heating is your #1 HVAC contractor in Grayslake, IL and the surrounding communities. We are the leading company for all of your air conditioning needs. If you need repairs, maintenance, or a brand new system installed, the technicians at Miller's Area Heating are the qualified and professional crew for the job.

We provide the highest quality service for your air conditioner. We also aim to educate and inform our customers. Informed decisions are good decisions. We want you to feel confident we are qualified to perform the service for which you are hiring us.

Air Conditioning Basics

The four main components to your air conditioner are:

Condenser: The condenser is the outside metal unit and where the gas from the compressor is condensed into a liquid. The gas entering the condenser is very hot. The temperature is then lowered, so the gas can convert back to a liquid.

Compressor: The compressor is inside the condenser. It circulates the pressurized refrigerant, to concentrate the heat, and changes the low pressure gas to high pressure.

Evaporator: The evaporator is the part of the system inside the home. In simple language, it absorbs the heat from your home.

Expansion Valve: The expansion valve controls the amount of refrigerant in your system.

All of these pieces are connected by a copper tube that handles refrigerant, creating a closed loop. Heat is collected in the evaporator, sent outside to the condenser. The heat is removed, and the cool air is recirculated back into your home.

AC Facts

An Air Conditioner Doesn’t Create Cool Air.
What happens in the AC process is actually the removal of heat from the air. Your AC uses a chemical called refrigerant to remove heat and transfer it outside. The warm air runs through the lines and coils in your unit and goes from liquid to gas and back again. During this process, the refrigerant removes the heat and transfers it elsewhere so that when the air comes out the other side, it is cool.

Your AC Will Remove Humidity.
Lower humidity helps the overall comfort level in your home by making you feel cooler, even if the temperature is the same.

Your Air Filter Needs To Be Checked And Replaced Every Three To Six Months.
(depending on the manufacturer’s recommendations)
A dirty air filter restricts your air flow, which reduces efficiency, costing you money, and over time can put stress on your unit and could cause a costly repair.

Maintenance, Maintenance, Maintenance.
Your air conditioner needs regular checkups to keep it running in tip-top shape. Having regular annual preventative maintenance will bring your system longer life and fewer breakdowns over all.

The Seasonal Energy Efficiency Ratio (SEER) measures air conditioning and heat pump cooling efficiency, which is calculated by the cooling output for a typical cooling season divided by the total electric energy input during the same time frame. A higher SEER rating means greater energy efficiency.

At Miller's Area Heating, we provide all the services you need to keep your AC running in top-notch shape. Call us at 847-223-0211 for repairs, maintenance, or new-system installation.

Need Air Conditioner Service?

Contact the experts at Miller's Area Heating.

Call us at 847-223-0211!

Air Conditioner Maintenance in Grayslake, IL 60030

“Tech did a good job and answered all our questions.” – Rich A.

Air Conditioner Installation in Round Lake Beach, IL 60073

“I was originally told that installation would happen on Friday @ 10:00 a.m. CST; however, due to one guy calling in sick and another tech working another job, I didn't get assistance until Noon'ish. Paul (I think that was his name) was amazing – he did everything by himself and got the job done. He was pleasant and I made sure he had bottled water since it was so hot outside! He wore his booties, too. Thank you!!”

– Mike S.

Air Conditioner Repair in Grayslake, IL 60030

“Excellent customer service, diagnosed and fixed problem by replacing the capacitor, took off top of A/C unit per my request and assisted me in cleaning out a mouse den that was built inside the A/C unit. Thanks for the great work and service. Sincerely, Lowell B. Raven, CPA”

– Lowell R.

Air Conditioner Repair in Grayslake, IL 60030

“Brian did a great job recharging our AC unit. He was efficient, informative and courteous.”

– Don H.

Air Conditioner Maintenance in Lindenhurst, IL 60046

“We had pre-scheduled our yearly maintenance and the workers were on time courteous and professional. This is the 5th year since we had upgraded and we are very pleased with out furnace and air conditioner and the yearly maintenance since then, see you next year.

John Delise”

– John D.

Air Conditioner Repair in Antioch, IL 60002

“I called because my air conditioner would not shut off outside ; Brian diagnosed the situation thoroughly explained step by step what was going on. He told me the unit was outdated and was going to try to do the best he could to keep the unit going. Also I called concerned and Millers was able to fit me in 3 hours later even on a busy schedule they were under. Millers is my go to heating/air conditioning service for life.”

– Frank E.

Air Conditioner Maintenance in Gurnee, IL 60031

“Technician was very professional. Again, I had problems with appointment time. Apparently it was told to me and the time given. However it was never placed in the appointment book. This is getting to be a problem and I have to follow up with appointments”

– Michael M.

Air Conditioner Repair in Lindenhurst, IL 60046

“I needed emergency service when a rodent got into my AC unit outside and I had to shut down the system. I called Miller's and a repair tech was here within the hour to take care of the removal and to the check system. I was back up and running in less than 90 minutes!
I have been a long time customer of Miller's with a maintenance agreement every year. Great Service and outstanding company to work with. Miller's is a real asset to our community!”

– Jill O.

Air Conditioner Maintenance in Mundelein, IL 60060

“Shane was thorough and meticulous during his maintenance of my AC unit. I appreciate his professionalism and knowledge.”

– Helen D.

Air Conditioner Maintenance in Round Lake, IL 60073

“Maintenance employees as well as the office staff are always courteous, thorough and respectful. Top notch customer service EVERY time. Thank you!”

– Kelly L.

Miller's Area Heating proudly provides HVAC service to Grayslake, Libertyville, Round Lake, Wildwood, Ingleside, and the surrounding Illinois communities. Visit our service area page for more coverage details, call us at 847-223-0211, or request service online today.