Your HVAC Contractor Isn't Asking About Your Envelope. Here's Why.
Most operators I talk to are buying systems. They are not buying outcomes.
The difference looks small on paper. It is not small. It is the difference between paying twice for the same problem and paying once for the actual answer.
Here is what I mean.
Last year a friend of mine was running an unhappy second-floor unit. The complaint was always the same. The living room was hot in the afternoon. The bedrooms were freezing. The thermostat was set to seventy-two and nobody believed it.
He called his HVAC guy. The HVAC guy looked at the equipment, said the unit was undersized for the square footage, and quoted him a new condenser, a larger air handler, and a re-balance of the supply.
The quote was eleven thousand dollars. The conversation took twenty minutes. The HVAC contractor never asked about the building.
This is the gap I want to talk about today.
When you replace HVAC equipment, you are solving for one variable inside a system that has five. The other four are the envelope. Walls, roof, windows, doors. If your envelope is leaking, if your attic insulation has settled, if the original builder used single pane glass on the west elevation, your HVAC system is fighting a problem the HVAC system did not create and cannot fix.
We walked the unit. The west-facing living room had two original windows from 1986. The attic above that unit had insulation packed down to maybe an inch of effective R-value because of years of foot traffic from people running cable. The duct serving the master bedroom was crushed where it crossed a joist. Not a little. Crushed flat.
The new condenser would not have fixed any of that. The new condenser would have been a bigger pump pushing harder against the same wall.
We spent about thirty-two hundred dollars. Two windows. A weekend of attic work. A duct replacement section that took a tech three hours. Same thermostat. Same equipment. Complaint gone.
This is not a story about a clever fix. This is a story about who you let make the diagnosis.
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The reason your HVAC contractor does not ask about your envelope is not because he is bad at his job. He is good at his job. His job is HVAC. The envelope is somebody else’s job. He is going to quote you the thing he sells. That is what contractors do.
Your job is bigger than his. Your job is the building. The building does not respect the line between HVAC and envelope and plumbing and electrical. The building treats those as one system because that is what they are.
A couple of practical things from twenty years of watching this play out.
Before you replace any major piece of equipment, ask what changed. If the equipment is the same age it has been for years and the complaint is new, the complaint is not coming from the equipment. Something else moved.
When you get a quote, ask the contractor what assumptions the quote is built on. If the answer is the square footage and the rated capacity of the unit, you have your answer. He is not modeling the building. He is sizing a box.
Walk the rooms above and below the unit in question before you sign anything. Touch the wall on the west side at three in the afternoon. Look at the ceiling stains in the closet. Open the panel and look at the duct. None of this is engineering. It is paying attention.
Finally, this is the difference between maintain and enhance, which is something I keep coming back to. Maintain is keeping the building functioning. Enhance is making it better. The eleven thousand dollar quote was an enhance disguised as a maintain. The actual maintain — the windows, the insulation, the duct — was cheaper and solved the real problem.
When the system is fighting itself, the answer is rarely a bigger fan.
—Jon
Reply and tell me the dumbest fix you ever paid for that did not fix the thing. I have a long list of my own.