So, I have a home built about 1980. All prior owners appear to have been very conscientious in terms of maintenance. So, without specifying the "R" value, the attic insulation appears to be new, within the past 5-8 years. Windows are Pella, but circa 1985.
All my problems regarding this post relate to one area. It is an area of approximately 1000 sq/ft, with 8.5' ceilings. About 500 sq/ft of this is a master bedroom/bath, and it communicates -- in terms of hvac -- with the main area of the house. It contains a bathroom (with a large shower, tub, two sinks, toilet, & bidet).
The area described above is conditioned by 2.5 ton unit.
This 2.5 ton unit is somewhat oversized. I could do the calcs, but I'm mostly basing this on comfort. The area is cold -- and clammy. That is, the temp drops very quickly, but the drop in humidity lags.
The rest of the house (about 2500 sq/ft, 4 ton unit) is ok in terms of humidity and temperature.
My problems are as follows:
It appears that someone moved a wall, and created a long, narrow, 'walk-in' closet out of one end of the master bedroom. The problem is that, there is only one a/c vent, at the entrance, and there is no circulation of air in the closet. That is, air does not flow the length of of closet, from one end to the other.
Well, this is mostly a large shower, it is used daily, and it is never dry. Mold, etc, are the typical problems.
So, I am wondering about the following solutions...
1) I install an 80cfm bathroom fan in the closet. It will run continuously. So, it is ventilating an area of about 206sq/ft -- all the time. I am sucking air mainly from the 2.5 ton unit, from the bedroom/hall(4 ton unit), and simply circulating air.
The bigger question is should I:
a) just dump the closet air up and out into the attic...and the outside...essentially reducing the tonnage of the a/c unit...or....
Perhaps I should:
b) dump the air back into the master bedroom, via a vent. (Or basically a hole in the wall -- a very easy solution.)
c) install an actual return back to the unit. (the attic is very open and accessible; so, this, and the prior, solutions, would be very easy to do.) So, I simply add a return to the far end of the closet, and keep the present (close end) vent. This gives me circulation -- b ut onlywhen the a/c is running, not otherwise -- and dehumid, again based on a/c efficiency.
Personally, I like the idea of the continuously running 80cfm low level fan -- continuous ventilation is good -- but I'm really not sure where I should dump the air...? Out or in????
Bathroom. Humid as hell.
2) My plan is to install a 350cfm in-line fan to vent the shower. It will run a max of 25-30min after use or shower. So, the question is, given what I am asking above, if I remove these 300cfm's of air from this area daily, am I...
...well, screwing up the current 2.5 ton a/c?