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"The gas company had to inspect the lines in my house. They looked at the Heater in the basement which is in a Utility room. AllTemp had installed the 90% HE heater and AC about a year ago. The gas company said the intake should run outside or to a more open part of the basement. 
The old heater was also vented incorrectly. I had no idea that both the old and new heaters did not have proper intake venting. Why should I? It is not my line of work. I believe AllTemp should have seem the problem when giving me the quote last year and corrected the problem when they installed the new system. AllTemp wants to charge me to do something that should have been done already and included in the initial installation.
I am trying to write a fair review. Their pricing was good for the heater and ac, they installed it quickly without making a mess, the sales person was professional. They install quality systems and do not try to sell you things you don't need. Example the sales person said I did not need a new filter box, all other vendors I got quotes from tried to push a new filtration system on me. 
So if you are looking at the sales process, installation, and price of the new AC and Heater they did a good job with the exception of not fixing the intake venting problem.
I just would like them to fix the intake vent situation. It is something they should have included with the installation.

***UPDATE****
All Temp agreed to fix the venting issue for no charge. Their technician came up with a clever venting solution and came back on 10/16 to implement it.  Took him 30 min and he was done.

Thanks All Temp for making this right."

"I recently hired them for central A/C installation and furnace replacement, and the experience was excellent. The team was professional, arrived on time, and completed the work efficiently. Everything is running perfectly now, and my home feels much more comfortable."

"We were experiencing problems with our central air conditioning unit. It was running, however, it did not cool the condo fast enough. The Four Seasons Technicians arrived on time, very professional, thorough explanation of what was wrong with the unit, and provided solutions on how to fix the unit. He was very helpful in helping me negotiate for a new coil and A/C unit. He was dressed in protective covering during COIVD-19. I would use Four Seasons Heating & Air Conditioning again. I was very happy with their service."

Rest Assured HVAC is open Monday - Friday 8am-5pm (regardless of hours listed on Angi/HomeAdvisor). \n \nWe are committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business. 24/7 Emergency Service available. \n \nRest Assured HVAC\nElgin, IL 60124\n(847) 224-2420\nhttps://RestAssuredHVAC.com

"The team showed up on time, did fantastic work, very clean, explained the entire system to me, and haven’t had any problems since installation. Would call them anytime in the future"

HDP Services Inc. is a locally owned and operated company specializing in heating, cooling, and refrigeration services for residential and commercial customers. With more than 4 years of hands-on experience in the HVAC and refrigeration industry, we are committed to providing reliable repairs, preventive maintenance, diagnostics, and quality workmanship. Our goal is to deliver honest service, dependable solutions, and customer satisfaction on every job

Here at Edelman, we’re your trusted local team for HVAC heating & cooling services around northern Illinois. We provide residential repair, replacement, installation, and maintenance.\n\nEdelman is built on 23 years of experience, a strong work ethic, and a commitment to delivering the best service to every client and customer. We stand behind our work with a 100% Satisfaction Guarantee on all service, repairs, and replacements.

Here at Premier Comfort Heating & Cooling LLC, we take pride in providing the best services and satisfying our customer needs. We specialize in Air Conditioning Repair, Air Conditioning Contractor, Heater Contractor, HVAC Contractors, Heating Equipment Supplier, Heating Repair, HVAC Contractor, Air Conditioning Contractors, Air Conditioning, Heaters, Heating and much more. We look forward to your business and serving you. Contact us today (844)467-4822

Here at Affordable Services 4 You, we sustain our company on reliability, great communication, integrity, and quality work. We strongly believe in giving our absolute best in all of our projects. We are experts in our trade, and will always keep you educated on your particular task or project. We can give you quality remodels at affordable prices.

Committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business.