So the HO gets noise, less comfort and shorter HVAC lifetime?Money.
Contractors that just use riles of thumb.
Quick buck contractors.
Home owners not willing to pay for high quality work.
Home owners not willing to allow ducts and or grilles to be ran where they should be.
GC's not willing to pay fo high quality work.
Just a quick few off the top of my head.
Funny you say that about the supply house.The bad part is.
Often, the better install is not a whole lot more.
On a simple furnace change out. It be 3 or 400 dollars.
On a simple A/C change out, it could be 600 or 1200 dollars.
On a full cut in, it could be a couple thousand dollars.
So it's 10% more, or 50% more for a good job? I don't remember the base price of my only new install.
Every install/change out, has included in it. The cost of training.
A lower price, often means less training.
So the techs doing the work. May not even know they aren't doing the job right.
While there is nothing wrong with OTJT.
Too many companies rely on it only. And the new techs are just taught the bad habits of the senior techs.
Thats why many techs don't know that a duculator doesn't tell you pressure in the duct. But rather how much pressure will be lost.
And why many hydronic systems have 3/4" copper used where it should have been 1" if not 1 1/4" copper.
One of the most common circulators on hydronic systems, is the Taco 007.
It is seldom the correct circulator.
Some years ago.
I was in a supply house. A tech in there was finding the right circ to use. By asking the counter guy.
The counter guy told him a 007 would move 12 gallons a minute at a head pressure of 10 foot.
In reality, a 007 can only move 3 gallons a minute against 10 foot of head pressure.
I corrected him, and showed them how to read a circ curve chart.
Or else they would have only been moving 3GPM.
(the tech was from the company that low balled me, and got the job from me)
My co-worker went with the motor they had in stock, in spite of what the book said. I guess it was in the summer, and it was hot, but he did understand the point of the temp. rating.You may have special ordered a motor that you didn't have to.
I'd think the HVAC manu's would lobby for more state control over this trade so that the HVAC equip. can perform better. A shoddy install gives their products a bad name.In PA, you call yourself a HVAC contractor, and you are one.