[bruno812]

I have an older goodman with a 10 seer rating. I had been thinking about installing new air for the tax credit but not sure if it would be worth it. The local guy told me today that he had bought some of the Goodman 4 ton 13 seer R22 units.

He said I would be better off if i got one of these cause it would cost me a lot more down the road if i had to swap out to the new R410 units. He is telling me that my old copper might not be rated for the new R410 and also you are suppose to install new lines because of the different oil in the systems. He has quoted me to install a new outdoor unit but is going to leave the old A-coil its a HT4248.

I am starting to have second thoughts about the swap out. I now have a 3.5 ton unit so he said he need to change something out on the acoil if i want to go to a 4 ton unit. Can he leave the old HT4248 and install a expansion valve and make it work OK?

If I leave the old A-coil just how much is the Seer rating going to drop?

Thanks for any help on this mater...Bruno

 

[Shamoke]

Spend a few hundred more and change out the A coil. Mixing SEER rating can lead to problems with cooling and it's then a non issue to go with the future proof R410A equipment. R22 is going away and ten years from now when you need to top off that new R22 system he sold you it will cost a lot more for the refrigerant.

Flush the copper line set out and reuse it if it's difficult to change it or if doing so would cause damage to your home like tearing out drywall ect.

I would be leery of going from a 3.5 ton to a 4 ton unless a heat load calc was performed and it said you needed the 4 ton. If you have had no problems with your old 3.5 ton system keeping your home cool and dry in the summer then don't go up to a 4 ton system, it won't keep your home dry.

Anytime a "professional" tells you that he/she can make something work "OK" by doing something strange to your equipment, seek out another opinion. If it isn't right you will be the one that pays, not only in comfort, but money to pay someone else to make it right when he walks away because he hasn't a clue how to fix it.

 

[amd]

He said I would be better off if i got one of these cause it would cost me a lot more down the road if i had to swap out to the new R410 units.

Compressor failure due to bad install with no warranty due to mismatch + higher utility bills will cost you more down the road than doing it right the first time.

He has quoted me to install a new outdoor unit but is going to leave the old A-coil its a HT4248.

A 4 ton 13 SEER won't operate anywhere near rated capacity and efficiency if the contractor is dumb enough to reuse the old coil rated for use with a smaller, less efficient unit. See http://www.comfortsolutionshvac.com/New_Folder/Bristol Compressor Mismatched Systems.pdf

Run!

 

[seanddd]

He's just trying to clear out his surplus inventory. Don't install the new R22 unit. New R410a units are not too much more expensive. The biggest problem is that 13-seer condenser will not work OK with 10-seer coil (same tonnage), and replacing a 3.5t with 4t of higher seer will be worse, without changing the coil.

I have an older goodman with a 10 seer rating. I had been thinking about installing new air for the tax credit but not sure if it would be worth it. The local guy told me today that he had bought some of the Goodman 4 ton 13 seer R22 units.

He said I would be better off if i got one of these cause it would cost me a lot more down the road if i had to swap out to the new R410 units. He is telling me that my old copper might not be rated for the new R410 and also you are suppose to install new lines because of the different oil in the systems. He has quoted me to install a new outdoor unit but is going to leave the old A-coil its a HT4248.

I am starting to have second thoughts about the swap out. I now have a 3.5 ton unit so he said he need to change something out on the acoil if i want to go to a 4 ton unit. Can he leave the old HT4248 and install a expansion valve and make it work OK?

If I leave the old A-coil just how much is the Seer rating going to drop?

Thanks for any help on this mater...Bruno

 

[BaldLoonie]

13 SEER won't get you the tax credit, 16 SEER does (with 13 EER) but almost always requires a new furnace with high efficiency blower motor.

 

[beenthere]

A old 10 SEER coil on a new 13 SEER outdoor unit. Might drop it down to anywhere from 8 to 12 SEER.

Going from a 3.5 ton, to a 4 ton. Will probably raise your indoor humidity. So you'll end up setting your thermostat lower. And won't save anything on your cooling bill.

How old is your older Goodman?

He's worried about the line set but not the indoor coil?

 

[bruno812]

How old is your older Goodman?

It's a CK42-1 and was installed in 2001 and the compessor has been replaced once. Its a 3.5 ton unit and makes a lot of noise. I bought the 2000 sq ft house a couple of years ago and the unit is really noisy. Its been running all day since it turned hot and will only get the house down to 77 but will shut off at night. Cleaned outdoor coils an changed filter. Maybe it a little low on R22?



He's worried about the line set but not the indoor coil?

I would guess you and i know why. Its hot in the attic and that would be a lot harder than swaping out the conderser.

I have to be honest i am not that all sold on goodman but maybe they have gotten better over the years. i have owned the house 3 years and already two service calls to replace parts on the heater. In my last house 12 years and never had to call any one but it didnt have all this fancy crap that just makes HVAC people money..

 

[beenthere]

Good chance. Most of your problems are from a bad/inadequate install.

I'd look for ways to decrease the cooling load of the house. Before just getting a bigger unit. Let alone a bigger condenser, that the air handler can't move enough air for.

 

[tinner73]

a 10 seer Gooman is far from fancy.

 

[beenthere]

a 10 seer Gooman is far from fancy.

:D:

 

[bruno812]

I'd look for ways to decrease the cooling load of the house. Before just getting a bigger unit. Let alone a bigger condenser, that the air handler can't move enough air for.

Is the old HT4248 not rated to handle the 4 ton? I was really hoping the 4248 meant for 3.5 and 4 ton units... Where is the goodman expert on here? HELP


I had always heard that you needed about 1 ton per 500 Sq ft. is this not even close?? I really dont know many HVAC guys who really do a real load study to see what the house requires but I am from Oklahoma..

 

[tinner73]

do the load calc yourself...click the bar at the top.

http://www.alpinehomeair.com/related/HT Coils Spec Sheet1.pdf..here's the Gooman cut sheet.

 

[bruno812]

do the load calc yourself...click the bar at the top.

http://www.alpinehomeair.com/related/HT Coils Spec Sheet1.pdf..here's the Gooman cut sheet.

Well i used this one and got 44800 but added the door opening and it went up to 51300 for Air load. Why do inside doors make that much difference?

So would a 4 ton not be a better unit???

http://www.consumerreports.org/cro/...s.org/cro/appliances/heating-cooling-and-air/air-conditioners/sizing-worksheet/

I had already looked at the Goodman link and seen what i thought it was for 3.5 and 4 ton units.

 

[tinner73]

i think that coil is good for up to 4 tons depending on the piston size.

 

[beenthere]

i think that coil is good for up to 4 tons depending on the piston size.

Also depends on the blower of the furnace. Can it move 1600 CFM?

Chances are. He already doesn't have duct work as big as it should be for his 3.5 ton.

 

[beenthere]

I think you added safety to your load calc.

Since if your load was really as high as you posted. The 3.5 ton would never have been able to keep your house cool.

Plus as Baldie said. There is no tax credit for a 13 SEER unit. As least no federal tax credit.

 

[tinner73]

Also depends on the blower of the furnace. Can it move 1600 CFM?

Chances are. He already doesn't have duct work as big as it should be for his 3.5 ton.

true dat.

 

[bruno812]

Since if your load was really as high as you posted. The 3.5 ton would never have been able to keep your house cool.

So do you think 77 is really all that cool!!

 

[beenthere]

So do you think 77 is really all that cool!!

Is it 77 in the house when its at outdoor design temp. Or when its above outdoor design temp.

Have you ever had it checked to see if its working right. Meaning they did more then just check the "pressures".

 

[bruno812]

Also depends on the blower of the furnace. Can it move 1600 CFM?

OK i got up in the attic and the furnace is a GMP100-4. It says its a 3 speed blower but i have not found how much air it will move at each speed.