Get matched with top window a/c unit service or relocation pros in Lake Zurich, IL

"Josh was very professional throughout the installation process and ensured my tenant on-site understood the basics. In addition, Josh sent Miguel the same day to ensure the humidifier was working properly."

"Great! Fast, friendly, and fair. Nice to work with a local, family owned, company that is customer focused with knowledgeable sales and service professionals. Couldn't be happier!"

"Home AC went out when it was 90 degrees outside. BESCO Air came out the next day and Voila! Problem found and fixed. I've used these guys for years for both heating and AC. When other companies don't have the resources to respond promptly, BESCO comes through for me. With them, loyalty still matters."

"Service was prompt, professional and well done."

"The technician arrived precisely on schedule and performed a thorough checkup of the heating system, using state-of-the-art diagnostic tools. He also explained the condition of the furnace and helpfully forecasted its likely future."

"My mother contacted Four Seasons Heating and Cooling on 01/26/2026 for a water leak. What should have been a simple service call turned into them replacing her boiler?something that was not needed. The technician arrived at 8:00 a.m. and instead of shutting the water off, allowed it to continue leaking for approximately three hours while he tried to determine ?how my mother?s credit was? so they could charge her for additional work. He even made the comment, ?Oh, there is no way you could afford this in cash,? which was extremely inappropriate and unprofessional. After being pressured into purchasing a new boiler costing nearly $17,000, her tenants were left with NO HEAT because the job was not completed correctly. A second technician had to come out to bleed the old pipes and stated that the original work was done incorrectly. I was on the phone during a call with customer service and had to take over because of how rude and disrespectful they were toward my mother. Once I took over "

"Very impressed with G & R Heating & Air! They arrived on time and got our heater running perfectly. Honest pricing and excellent customer care. Will definitely call them again."

"I was happy with the service. They were efficient and professional. I would hire them again. I highly recommend "

"It was excellent. They did a great job. It was cool and nice. The price was good. I was totally happy with the work. They cleaned up their mess."

Semper Fidelis Services brings military-grade discipline to HVAC and plumbing. Founded on the principle of being "Always Faithful" our team offers 10+ years of technical experience, including an AAS in HVAC/R and Universal EPA certification. We specialize in high-quality, reliable residential and commercial services with a strict commitment to doing the job right the first time.