ReplyDid he Reuse your exsisting ductwork or did he modify it?
Regular Guest
Is this correct? My HVAC contractor agreed that our house only needed a 3 ton unit (3150sf, SIP walls and roof, energy efficient everything.) However, he says we have to have a 4 ton unit in order to match the blower necessary for the size of the house. Is this correct? He says it doesn't matter if the unit is oversized since we have a Carrier Infinity 19 and it will only run on low unless really needed. Now that it is installed, I have never seen the unit run more than 6 minutes even on a hot day. I am not sure if I can tell the difference by hearing but I cannot say the unit has ever sounded like it was running on 2 different speeds.
Thanks
Professional Member*
Did he Reuse your exsisting ductwork or did he modify it?
Professional Member*
if it only needed 3 tons why would it need a 4 ton blower..
Regular Guest
He said the 4 ton blower would not be able to supply enough air for the 3150sf of the home. This was new construction so sizing ducts was up to him.
Professional Member*
he goofed.
if the load was only 3 tons the house only needed 3 tons worth of air flow.
now you have an oversized system that probably will not run enough to dehumidify.
God Speed, Jim. We'll miss you - 2-26-23
So now you have a 4 ton unit. Running in first stage, at a reduced air flow.
That is about the same air flow as you would have got with the 3 ton system.
He goofed, or just doesn't know any better.
Do a search for member "paul42".
He has a 4000 sq ft house, with a 2 ton system.
Professional Member*
Hmmm. Day late and a dollar short. You should have visited this website before the installation. We'd have told you then not to accept anything but a Manual 'J', Manual 'D' and Manual 'S' calculation, layout and equipment selection. Anything less is guesswork and bush league. If the house called for 3-tons, then it should have 3-tons. If it called for 3.5-tons and you got a 4-ton that runs 6-minutes on the hottest day, I'd say someones cacluations are suspect. Ask for the load calcs. Seems like the low ball system even if you paid for top drawer.
If YOU want change, YOU have to first change.
If you are waiting for the 'other guy' to change first, just remember, you're the 'other guy's' other guy. To continue to expect real change when you keep acting the same way as always, is folly. Won't happen. Real change will only happen when a majority of the people change the way they vote!
Regular Guest
Was this unit recently installed or is the first year over and done with ? If your still within your first 6months-1yr tell him the problems yoru having and ask him to change it out with the proper size equipment.
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