What to do when an HVAC installation fails inspection
Bad HVAC installations often involve dangerous issues like gas leaks, missing thread compound, uninsulated ducts, and mismatched or outdated equipment. These critical safety code violations and missing warranties leave homeowners dealing with failed inspections, hazardous living conditions, and unresolved cleanup costs.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1Buying a different size filter and trying to cover the opening with tape
- 2Calling the original installers back to ask questions
- 3changing the crossover duct independently
- 4checking system pressures, subcool, and superheat
- 5attempting to register the equipment online to check warranty status
- 6Used insulation foam and insulation tape to seal the feed tube under the window panel
- 7Added a layer of white duct tape and a lace curtain to hide the installation
- 8Used the condensate to water plants
- 9Calling a reputable company to assess the situation
- 10Threatening legal action or demanding a full refund
- 11Having family members present during confrontations with the contractor
- 12Having the company measure the space and fit the heat pump with a baffle to direct air upwards
- 13researching the issue independently
- 14calling professionals to identify the cause
- 15Using brass adapters at the outdoor unit to connect larger pipes to smaller ports
In their words
Unedited, most upvoted first, each linked to the thread it came from.
“I DID NOT INSTALL THIS!! MY LANDLORD DID! thanks for the help in coming up with a temporary solution to this disaster mini split in my rental room.”source ↗
“AC starts to short-cycle”source ↗
“Co2 alarm starts blaring!! Cats are running up the walls and I'm 😡.”source ↗
“Water is seeping up from under our one year old floor and I hear dripping behind the return air register.”source ↗
“He admits to: not being a licensed electrician, not doing the load calculations to determine the correct tonnage for house and claims that he did it to save us money.”source ↗
“Worst part? The lines are already buried in concrete. Ripping them out is 100% off the table unless I take a sledgehammer to my floors.”source ↗
“I recently just hired a pretty well google-rated HVAC company to replace my 18-year old central AC in NYC. But it has proven to be quite a headache.”source ↗
“So, I was quite alarmed to see that my new heat pump is currently just 13 inches away from my neighbor's, blowing hot air directly into it.”source ↗
“Now my concern is how it will affect my unit. Will a baffle cause static pressure that will just ruin my system over time? Is there any other solution to my current problem given this set up?”source ↗
“There’s no return vent inside my condo. The previous owner replaced this 2 years ago and had been living like this with no return vent. It stinks inside and very humid.”source ↗
“I physically measured the connection ports on the machines and they don't match:”source ↗
“My installer already ran the copper lines in the wall. Because of the mixed sizes, he ran a 1/4" pipe for the liquid line and a 5/8" pipe for the gas line.”source ↗
“The inspector failed the install because of a gas leak in the furnace.”source ↗
“One of the galvanized pipes supplying gas had no thread compound or tape on it.”source ↗
“I have what I believe is fiberglass dust that has settled on my furniture.”source ↗
“They gave him a brand new 3-5 ton indoor electric air handler & a 5 year old 410-A condenser. They also didn’t change the metal uninsulated crossover duct underneath the house.”source ↗
“On top of all this he has a basic 5 year warranty , I’m guessing because the don’t give a 10 year warranty on 5 year old equipment? Or they didn’t do the warranty all together?”source ↗
“The bottom part where the filter replacement is should be facing the other way so I can change the filter inside, not outside.”source ↗
Where this came up
People with this problem also raised
- 12Why does my new plumbing still have bad water pressure and risky joints?
- 2Are open cavity vent returns and exposed pipes normal in new construction?
- 20Electrician installed an outlet instead of a generator inlet box
- 2How to tell if home repair work is actually bad
- 50Landlord built a fence around the AC and it broke
- 23How to fix previous owner DIY nightmares