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Alex wrote:
>Hello, My wife and I are planning on enclosing our garage next summer, and
>this will bring our 1600 sq house up to about 2100 sq. We planned on
>upgrading the 23 year old central air/heat system in the house then,
>but a couple of weeks ago the unit died and needs replacing now.
>
>We currently have a 3 ton system but in anticipation of convering the
>garage in we're upgrading to a 4 ton, 15 SEER system. I know if the
>system is too large it won't remove enough humidity from the house and
>mold can set in, plus shutting on and off alot is bad for the system,
>however will us having the system in place for 6-8 months hurt it like
>this? Winter is here, and I doubt we'll be using the air conditioner
>much until next March or April, just the heat if that, but just curious
>of what we need to look out for.
>
>We live in Central Texas where the humidity generally stays around 50%
>or lower, and only rarely jumps up to 65% or higher. I figure worst
>case we can get a stand alone dehumidifier if humidity does become a
>problem. Will this help? Alex
>
>
You should have posted here before making a decision, it's probably too
late now to use other options.
You are adding 500-sq. ft., if you know the materials that will be used
windows, insulation, etc., you should be able to do a heat-load calc.
How much airflow will your ductwork & airhandler produce, perhaps only
enough for the existing 3-ton condensing unit.
The 4-ton will only deliver what the airflow will permit! Read the
linked pages below. - udarrell
Perhaps you could have bought a small "mini ductless system"- Soleus-air
units have adequate airflow & eliminate adding ductwork.
Then you could have stayed with the 3-ton set-up.
--
PROPER A/C UNIT & DUCTWORK Sizing is over 70% of Operating Efficiency
http://www.udarrell.com/proper_cfm_btuh_duct_sizing_air_conditioning_systems.html
Solving - External Static Pressure (ESP)
http://www.udarrell.com/udarrell-air-conditioning.html
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Re: Upgrading central AC unit before adding onto house -- caveats?
