Glad I found this site I sure hope that I can learn and understand more of this so when it comes time to replacing the whole thing which will be soon I will know what I am doing. Ok first of all my system is about 20 years old and yes it is still working good for the most part and yes it is amazing since I am in Tx. lol
First question is I am thinking Goodman Gas Furnace Stage 2/ Multi speed 95% 69000 btu 3 ton. I would like to put in a Goodman media air filter (whole house filter) what size would I need the reason is they have 3 different sizes the 16*25, 20*20, or 20*25 the demensions on the furnace is 17 1/2 W, 28 D, and 40 L?
Also going to be taking out the old return air box sheetmetal and replacing it with an 18" round duct for better efficiency. Will my 20 by 25 return in the wall near the floor work or will it need to be bigger. My unit is in the attic sitting horizontal.
Second question thinking about getting an 18 seer Goodman 2 stage condenser and wondering if it is worth the money?
Third and last for my evaporator coil have two options should I go with the Goodman horizontal slab 12 D, or go with the Goodman horizontal cased evap 26 D, which is better right now I have the slab?
here is one back to you..
what is the sq ft of living space?
has any of the companies done a load calculation?
is the house on a slab?
ducts and mechanicals in the attic?
have you thought about open cell foam for roofline which will
put ducts & mechanicals in conditioned space?
notice how I never stop with just one question?
here in La. I find that 15 to 16 seer works well.
when you have 2 stage condenser in a vented attic the
system operates in a lower speed and ducts condensate
lower speed means more humidity removal and colder air moving through
this is why one of the larger a/c companies got into the foam
biz in my area.
best of luck.
The cure of the part should not be attempted without the cure of the whole. ~Plato
My sq ft. is 1500
Originally Posted by energy_rater_La
load calculation no one
yes i sit on a slab of crete lol
everything is in the attic except the condenser is outside.
My house is old, means built in the 50s i have about 2 inch of insulation up there now but about to blow in about 17 inchs more put in new windows double pain and new doors. Not looking to keep the house at 60 in the summer just pleasent around 78 to 80 you know what I mean if you live in houston why get to cold when you have to go out side and it is hot hot. plus the family hates summer colds. That maybe a reason that my old unit has lasted me this long I am not hard on it. The only reason i am thinking about replacing it is the evaporator coil leaks like a frieght train but been looking at new coils and most can still use the R22. Would it be more or less to buy a new one let someone install it or just have a tech take out the old one clean it and put a new pan in it. I am thinking of the new one I can always use it when i get the new system in place?