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Bigger air unit

Posted: Fri Jun 25, 2010 2:06 pm
by Gourdlady
Wondered if you guys could weigh in on this. I have a double wide 50x24 mobile home and we had a front room added on that measures around 12x15. We need to get air and heat out there. I had to call a repairman the other day as my air unit went down and was questioning him about whether my 3 ton unit would be able to handle the extra room. He suggested upgrading to a 3.5 ton unit. I know mobile home duct work runs a bit different than traditional built homes so I am wondering if just going up a half ton is going to suffice and also if my mobile home wiring will handle this increase. My home is a 1990 Fleetwood. Any thoughts would be appreciated.
Thanks

Re: Bigger air unit

Posted: Fri Jun 25, 2010 4:03 pm
by Robert
Hi,

Need to do a Manual J Load Calculation to know what size is truly needed.


Go to hvac-talk.com , then click on HVAC Calc at top for a good homeowner version.


Wiring and duct should be fine with an upgrade.


Thanks,
Robert

Re: Bigger air unit

Posted: Sun Jun 27, 2010 12:13 pm
by Gourdlady
Thank you Robert. I'll check into what you have shared.

Re: Bigger air unit

Posted: Sun Jun 27, 2010 4:59 pm
by Robert
Hi,

You're very welcome, happy to help. Wanted to add that your furnace should have info on it in data sticker or nameplate or on front of blower housing stating what size a/c the furnace and duct can handle.


Most are 4 tons, so should be ok.



Thanks,
Robert

Re: Bigger air unit

Posted: Wed Jun 30, 2010 9:25 pm
by Gourdlady
Okay, I'll check that. I have the paper work on the furnace and air unit too, so I'll look at those too. The repair guy said he thought a 3.5 ton would work but I am thinking if my wiring and all can handle it maybe a 4 ton is better. The 3 ton that we have does struggle in the heat of the day. I have to pull the shades down to help and we use ceiling fans too.

Re: Bigger air unit

Posted: Wed Jun 30, 2010 10:28 pm
by Robert
Do the Manual J Load calculation to know for sure what size is needed.


Thanks,
Robert