Air Conditioning in Crystal Lake, IL

Bruce Bermann
Bruce Bermann
February 17, 2021.
Trustindex verifies that the original source of the review is Google.
Had Efficient replace a humidifier and tune up furnaces the other week. Nothing but good things to say about the experience-timely, accurate, complete. Definitely recommended.
Troy Suarez
Troy Suarez
January 13, 2021.
Trustindex verifies that the original source of the review is Google.
The tech arrived on time and was very friendly. I got a text from their automated service that told me the tech was on his way so I didn’t have to sit around and wait. He serviced my furnace and garage heater and explained what he did when the job was done. They also provided recommendations for a chimney issue that was outside their expertise. Will definitely be using them again.
Colleen Huber
Colleen Huber
December 17, 2020.
Trustindex verifies that the original source of the review is Google.
Absolutely phenomenal service! Chris has assisted me twice, he’s incredibly professional and knowledgeable!! Matt has assisted me once and he’s also incredibly professional and knowledgeable! Both men are kind and considerate! Absolutely wonderful service! Always on time! Always a joy to work with! They’re simply the best!!
Alan Lubow
Alan Lubow
November 28, 2020.
Trustindex verifies that the original source of the review is Google.
Good Value. Quality Workmanship. Reliable Forced air Gas Furnace at a fair price. We were referred to Efficient Heating and Cooling from a neighbor. We received two quotes: one for an updated version of our 30-year old furnace and one for 95% efficient furnace. The costs were in line with industry standards so we went with the 95% efficient furnace from Efficient Heating based on our neighbor’s recommendation. The installation went as planned; the workmanship on the sheet metal and air intake and exhaust vending was spot-on. From start to finish it’s just what you expect - quality work, quality product, fair price.
Karen Lavin
Karen Lavin
November 27, 2020.
Trustindex verifies that the original source of the review is Google.
They cleaned the furnace and caught a damaged part causing our humidifier to not work. We were unaware of the problem. They fixed it in no time and everything is working more efficiently now.
Jason Alt
Jason Alt
November 19, 2020.
Trustindex verifies that the original source of the review is Google.
Justin and his team were great. Very nice and easy to work with, and they went the extra mile to track down and solve my furnace problem. I will definitely use them again in the future.
joe smith
joe smith
November 7, 2020.
Trustindex verifies that the original source of the review is Google.
Informative. Matt came by and walked us through everything. Explains how our system works and what may cause problems. Expert advice was offered and we felt comfortable with the entire service along the way. Justin and Chris did the install efficiently and clean. I was happy to hear back from for a follow up.

Our Services

Heating Service - Efficient Heating & Cooling


Efficient specializes in cost-effective, energy efficient heating services, including furnace...

Air Conditioning - Efficient Heating & Cooling

Air Conditioning

Want to achieve maximize indoor comfort, energy efficiency, and energy bill savings with your...

Indoor Air Quality - Efficient Heating & Cooling

Indoor Air Quality

Are you suffering from allergy like symptoms in your own home?

Indoor Air Quality Assessment - Efficient Heating & Cooling

Indoor Air Quality Assessment

Looking for an energy audit company near you?

Service & Maintenance - Efficient Heating & Cooling

Service & Maintenance

Preventive maintenance and fast repairs are essential if you want to get the most from your...

Repairs - Efficient Heating & Cooling


Just like your car, your heating and AC systems need regular maintenance and repairs to operate...

Thermostats - Efficient Heating & Cooling


With features like smartphone control and custom temperatures for different times of the day, a...

Tankless Water Heaters - Efficient Heating & Cooling

Tankless Water Heaters

An efficient water heater can have a major impact on home energy consumption, providing...

Heat Pumps - Efficient Heating & Cooling

Heat Pumps

Heat pumps are a cost effective way to heat your home in the winter months — and they can cool...

Commercial HVAC Services - Efficient Heating & Cooling

Commercial HVAC Services

Keep your employees comfortable, & your monthly heating and cooling expenses at a minimum...

Air Sealing - Efficient Heating & Cooling

Air Sealing

Protect your home from outside contaminants, and uncomfortable temperatures when you seal up the...

Water Heaters - Efficient Heating & Cooling

Water Heaters

Traditional water heaters use electricity or combustion to create the heat that is then...

Why Trust Efficient Heating & Cooling

Extensively Trained Technicians - Efficient Heating & Cooling
Extensively Trained Technicians

Our technicians are extensively trained and continually being trained on the latest technology. Rest assured we won’t be coming to your home to practice.

100% Drug Free & Background Checked - Efficient Heating & Cooling
100% Drug Free & Background Checked

You can trust the person entering your home. All of our technicians are 100% drug free and background checked to ensure your highest safety.

Family Owned & Operated - Efficient Heating & Cooling
Family Owned & Operated

We are a family owned and operated company dedicated to helping our neighbors– You can expect only honest recommendations we’d advise for our own family.


At Efficient Heating & Cooling we know that sometimes budgets can be broken by emergencies. We offer the opportunity to find a plan that fits your budget. With flexible financing options, you can invest in your house or respond to an unexpected heating or cooling need without breaking your budget!

More Details

Call Office Today: 815-347-8353
Call Cell Today: 847-204-1743
Email Today:

Accepted Payment Methods:

Payment Accepted
Business Hours:
Monday   8:00 AM  – 5:00 PM
Tuesday   8:00 AM  – 5:00 PM
Wednesday   8:00 AM  – 5:00 PM
Thursday   8:00 AM  – 5:00 PM
Friday   8:00 AM  – 5:00 PM