Get matched with top ducts & vents installers and replacers in Union City, CA

"Fernando was great. It was an easy fix and he didn?t make me feel like an idiot because I could have fixed it myself!"

"Great service"

"Very well!"

"We had a wonderful experience with Comfort Energy! The service person, whose name was Chance, did a thorough evaluation of the problem with a focus on saving us as much money as possible, to either repair or replace our 30-year-old heat furnace. He quickly determined that our inlet filter was too dense (it was a Merv 11 and should have been a Merv 8) and that that was probably causing the heater to go off an on every 5-10 minutes. He then tested and confirmed his hypothesis. He also performed a CO test to make sure there wasn't anything more serious going on. Finally, he gave us a good idea of replacement options, which we should probably do before the next Winter, but not necessarily right away. All in all, this is exactly the kind of assessment we needed, and it cost orders of magnitude less than what was estimated by the first service company we had come out. Chance was great, and Comfort Energy is our go-to for heating and cooling service and/or installation from now on."

"Rittinger responded quickly. Alan, the tradesman they sent over was professional and quick. I hired them to install a clothes dryer vent and to open up a vent in my garage for the hot water heater. The work was high quality and installation was clean."

"I was extremely impressed with the service provided by Air Sharks, who replaced my aging furnace and damaged heat ducts. Elizabeth provided a detailed explanation in a friendly, professional and understandable way. Pricing seemed reasonable, and was 25% below a previous estimate. Daniel and his crew did a fantastic job removing and replacing the new furnace and the duct system in a very tight crawl space. They left the furnace looking absolutely beautiful and clean. I highly recommend them"

"excellent work with good price!"

Giant HVAC is a locally owned and operated heating and air conditioning company based in Fremont, CA, proudly serving the Bay Area. With over 20 years of hands on experience, we specialize in HVAC system replacements, air conditioning installations, furnace upgrades, ductwork, and zoning systems.\n\nWe focus on doing things the right way with clean installations, properly designed systems, and honest recommendations tailored to your home and budget. No pressure and no shortcuts.\n\nWe are licensed, bonded, and insured, and we handle everything from start to finish including permits, HERS testing, and final inspections.\n\nWhether you are upgrading to a high efficiency system, adding air conditioning, or looking for better comfort throughout your home, we take pride in delivering reliable and long term solutions.\n\nGiant HVAC built on comfort, honesty, and quality workmanship.

"Slightly misquoted the job, but made up for it and did a fantastic job."

Hi, I’m Saul, owner of a local HVAC company serving homeowners across the Bay Area.\n\nWe specialize in AC installation, furnace replacement, ductwork, thermostats, and fast, reliable repairs. Whether your system stopped working, needs an upgrade, or you’re looking to improve efficiency, we provide clear options and honest recommendations.\n\n✔ Upfront, transparent pricing \n✔ Clean, professional installations \n✔ Fast response times \n✔ High-efficiency systems (including Gree R-32) \n✔ Help with rebates and energy savings \n\nOur goal is simple: do the job right the first time and make the process easy for you.\n\nIf you're having issues with your heating or cooling system, send a message and tell me what’s going on—I’ll help you figure out the best solution.\n\nAre you looking for a repair, replacement, or just an estimate?