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Typical your area range for this kind of work, from regional averages — not a quote from T&H Mechanical Systems. Use it to sanity-check bids, then get the real number in writing.
Estimated range
$5,000 – $11,400
Typical HVAC project around $8,200
T&H Mechanical Systems handles heating, air conditioning and indoor air quality work for homes and businesses. Its website calls it family-run for 40 years and lists a service area from Norwalk, Stamford and Greenwich to Rye and Scarsdale. A 2014 customer said Harold took on an HVAC system another installer had left with zoning, air-movement and balancing problems, and that the job required extensive re-zoning and re-configuring. In 2014 that customer also said Harold did not charge to add a damper for one bedroom zone, saying it should have been part of the initial service. A 2012 customer with a blown compressor said Harold, the owner, quoted multiple options; that customer chose a full system replacement, agreed on a Friday and completed by the following Wednesday. A 2014 customer said the final price was exactly as quoted and the work was completed in 5 days. When white PVC drainage piping stood out on that 2014 customer's brown house, the owner sent someone the next day to swap it for clear tubing at no extra cost. A 2017 customer described a $6,500 system that, by that account, had reached $8,000, and said Harold did not connect the condensation line, so the unit leaked and buckled hardwood floors on the floor below. That 2017 customer also said Harold refused to provide his insurance information. A 2009 customer said the worker flipped a switch to restart the system and then said he would charge $100 for it. It holds an active Connecticut D1 heating and cooling licence, HTG.0308704-D1, under Harold Hermes.
Beware!!! Harold and Joe are deceitful and negligent! I am currently having a horrible experience. 9 Months ago Harold sold me a "whole new system"(2.5 ton) for $6500 complete. He did not tell me it would not include parts as directed by Carrier for a proper installation. In the winter, the heater did not work and he made excuses to charge me $1,100 (originally billed $1,800, yet quoted by Harold $700 prior to work) for putting another air return hole in my office wall because there was a air restriction and when complete it still did not work. Turns out he installed too small an air opening in the unit and had to permanently remove my UV germ killing light to expand it. He did not connect the condensation line so the unit leaked until I noticed it buckled my 3/4" scraped hard wood floors on the floor below and now I have mold growing from my ceiling and walls(photo attached). He refuses to provide his insurance information and denies responsibility because he "does not change my air filters". He changed the 2nd to last 2 filters because he was still doing repairs to get my HVAC unit to work. Also ironic because he tried to get me to eliminate the use of an air filter completely to improve the air flow and reduce restrictions. He charged another $350 to connect the condensation line and replace the water pump(which was still working fine, if he connected it). That $6500 system is now $8,000 (plus the cost of damage to my home)and still has issues. This is not even a year old. Oh yeah, he did not replace other necessary parts like the pad for leveling the outside condenser (included by all competitors). These guys are con artists and I cannot recommend them. Stay away or it will cost you $$$! Paying another company more money will save you money very quickly down the road.
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All went well and work was performed in two visits - one for initial tune up and evaluation and the other to perform repairs
I would use them again in the future.
The service has gone well, they have been timely and it's worked well.
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Certified attributes are verified against the public registry. Others are the business's own statement.
1 change recorded — last scanned Oct 13, 2026.
Water heater replaced the same day4.1
New heating system installed in one day3.9
100 years in businessNot yet rated
31 years in business3.6