Of course the salestech who also thinks you should change a perfectly good A/C won't make his quota coming up with a HX swap. Nor will he likely make as much money doing the swap as selling an expensive system.
Which makes more sense to you? CONSERVATION - turning your thermostat back and being uncomfortable. Maybe saving 5-10% ENERGY EFFICIENCY - leaving your thermostat where everyone is comfortable. Saving 30-70%
The smoke test is a legitimate test. In fact it was once the test recommended by Trane. They also once made, and probably still do, "smoke bombs" designed for testing heat exchangers. More testing is necessary. Don't write off the first contractor just because the second contractor is not well trained.
The only true knowledge is the pursuit of knowledge
Does anyone have a video of a smoke test being performed? I've read about them - "Using a smoke puffer you can fill the burner chamber with smoke. Then turn the blower on. If the smoke sprays out and away from the burner opening you have a good indication of a leak in the heat exchanger."
The tech did demonstrate this. However, the word "spray" is subject to interpretation. Yes, there was some movement of the smoke coming back from the burner, but how vigorous does that movement have to be to be a "spray". Without the burner on the smoke swirled around. Once it was turned on it swirled faster and came out.
So far I haven't been able to find a video of how this looks like in a normal furnace and how it might look with a crack in the heat exchanger.
Sounds like you have a compromised heat exchanger, indicated by 2 legitimate test procedures. If the email is accurate. Never used a smoke test but I have seen literature on it and it is legit. Using the magnehelic is also a legit test that I have used. If both were used and both indicate a split then you most likely have a split. A simple CO test would not be a good test with your furnace. Older natural draft furnaces could produce alot of CO when heat exchanger split and it could then be pushed into the conditioned space so a CO test was a common way to verify a split. Your furnace is induced draft and totally different operation.
Tommy knocker...in clarification...the tech's boss said they perform a magnehelic, but the tech did not do that. The tech only puffed smoke into the entrance of the heat exchanger and we watched the smoke swirl back towards us. The tech then declared the heat exchanger cracked.
Found out that in our small neighborhood (65 homes) this same contractor has told 4 families that they cracked heat exchangers in the last 2 months. We don't all have the same furnaces. Last year they did the same to 3 other families. This is a new development. Most homes are in the 8-10 yo range. Does this seem like a lot of homes for the size and age of the neighborhood? This was the contractor who did the installations for the builder so they ended up doing a lot of work for the homeowners with seasonal inspection contracts.
I hear some of you say that checking CO is not a good test, so what is? Does anyone know if York has any tests or inspections they recommend?
Second visual inspection, if you trust this company, good, agree to a new heat exchanger, new furnace contingent upon the fact that they can show you the crack once they remove the heat exchanger or replace the furnace. If not, they put it back, as it was, no harm, no foul, no charge.
If they are confident in the smoke test, they should have no problems? right?
A cracked heat exchanger is easy to spot, when it is not inside of the furnace, inside of the furnace, it can be a b***h. If they are sure it is cracked, they would accept your challenge, otherwise, they would walk away, or am I wrong?