What size condenser quoted? What size do you have now?

Why a high eff furnace when your winters are so mild?

And dealer is definitely oversizing you with furnace which will only contribute to comfort issues and hurt you in pocketbook for operating costs.

IMO

An 80k 90% furnace in a 1300 sqft home in Auxtin, TX is ridiculous. It would likely be more than enough for many homes in the Northeast that have twice the living space. Of course heat loss isn't simply based off square footage, but that should give you an idea of how oversized it is. Do you want to do business with a dealer that does not size equipment properly to meet your comfort needs? Unfortunately you just have to wonder what else they will do wrong.

Carrier and Bryant are the same product, but it's interesting they're proposing a Bryant furnace with a Carrier condenser.

This post was edited by ryanhughes on Tue, May 7, 13 at 12:36

Thanks for the info, I have a 2.5 ton a/c system today and they are going to replace it with a 2 ton unit because of the spray foam in the attic ceiling. I have to have a 90% or higher furnace because of the city code. I understand it want have a pay back, but is that unit over sized for heating. What amount should have I have? if a 80k is over sized should I have a 40k for furnace for my house.

Thanks

Sizing isn't a guessing game. They need to do a Manual J load calculation to determine your home's heat loss and heat gain. I suspect a 40-45k furnace would be sufficient with plenty of room to spare. I don't know off the top of my head the smallest size 90% furnace Carrier offers, but your Carrier dealer should.

This post was edited by ryanhughes on Tue, May 7, 13 at 12:56

I find it unbelievable that a state like Texas with its moderate winter climate would allow a city to mandate a 90+% efficient condensing furnace.

You have verified that with the correct city dept?

IMO

This post was edited by tigerdunes on Tue, May 7, 13 at 14:55

The furnace you have been quoted is a Bryant 2-stage 96.2% furnace with an ECM blower. It also comes in 40,000 and 60,000 BTU sizes. I would think the 40,000 BTU would be sufficient for your location.

You should get a true 2-stage thermostat if you want to get the full benefit out of this furnace.

You have been quoted a 3.5 ton coil. I am not sure if that is a legal match with the 2 ton condenser. I think 2 tons is going to be marginal for 100+ degree summers even if you foam the attic. You need to verify all model numbers and sizes before you finalize the agreement.

I also suggest getting a 4 inch media filter.

Thanks again for your information.

Aren't the numbers below the model numbers
Furnace model- 925TA48080E17
Evap cool- CNPHP4321
Condenser- 24ACC6

What should I be asking the contractor if they are not?
Thanks

The model number of the condenser is incomplete. It does not indicate the size. It is also a Carrier model number. Is he planning to use a Carrier condenser and a Bryant furnace? I question the size of the coil and the furnace. They both seem too big.

Ask for the AHRI directory number for the system. This will indicate if the parts are a legal match.

I emailed the contractor hopefully he will respond.

The installer stated that the AHRI # is 4744838.

So knowing very little about A/C system does that clear things up?

4744838 Active Systems COMFORT 16 PURON AC CARRIER AIR CONDITIONING 24ABC636A**30 CNPH*4321A** 59*P5A080E17**16 34400 13.00 16.00 1 RCU-A-CB 260 Yes

A nice system but you won't ever get me to believe you need an 80 K.

That furnace is available in a 60 K size, probably still oversized but better than the 80 K.

4744837 Active Systems COMFORT 16 PURON AC CARRIER AIR CONDITIONING 24ABC636A**30 CNPH*4321A** 59*P5A060E17**14 34600 12.70 15.50 1 RCU-A-CB 270

IMO

This post was edited by tigerdunes on Fri, May 10, 13 at 12:07

One other thought.

You might consider the next model up in AC condensers, Performance 16. A nicer model.

Also insist on the ALA aluminum evap coil. Dealer will know.

4765020 Active Systems PERFORMANCE 16 PURON AC CARRIER AIR CONDITIONING 24ACC636A**30 CNPH*4321A** 59*P5A080E17**16 34000 13.00 16.00 1 RCU-A-CB 257 Yes

You should note dealer has quoted a 3 ton condenser not the 2 ton you referred to in earlier post. I think even with your attic foam upgrade, I might just stay with a 2 1/2 ton condenser.

IMO

I think your right about staying with the 2 1/2 ton system. Even after I spray the foam in the attic. Would it be okay for him to just install the 3 ton if that is what they have. Because really does 1/2 a ton really make that much of a change.

Thanks

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Here is a link that might be useful: Goodman Air Conditioner Systems

"Would it be okay for him to just install the 3 ton if that is what they have. "

If you are working with a good contractor, then he won't install "what they have". Why would you pay for a larger condenser than you need? It will cost more money up front, run less efficiently, and not be as comfortable.

There is a current proposal that would increase the minimum efficiency of furnaces to 90% for some northern parts of the country, Texas is not included. I would have a hard time believing a particular county would mandate this on their own. I believe right now it is currently being challenged and not yet active.

Here is a link that might be useful: DOE 90% Furnace Rule

Apparently you don't believe in the spray foam. A 2ton keeps my 1600sqft house 75 when it's 100 outside with normal insulation. If you don't think spray foam is significantly better why drop $10k to have it done? A 1.5ton should be plenty if the contractor does the spray foam correctly. Remember all the ductwork and air handler will now be inside conditioned space which saves about 1/4 of your cooling/heating load. A 40k furnace is more than enough, but most brands don't carry 90% that small. Rheem has a 45k, which is the smallest 90% I've seen.