Type: Posts; User: dan sw fl
3 ton max heat pump only needs 1,200 CFM
Heat Loss is ~ 25,000 BTU/HR
Square footage each floor?
< 2,200 square feet ranch, I can do it quickly.
More than 2,500 sq feet or 2 floors, I 'll give recommendation.
See my e-mail address in profile.
Your contractor should install controls to lockout backup resistance heat when the outdoor temperature is above 30 degrees.
Of course, one service call to make a controls change may take up to a...
If the ceiling is currently R-10, are the walls R-6 or less?
Also, is Glass U-value = ~1.0 for the 50+ year old windows?
Does your utility provide hourly and/or daily KW usage?
46,000 BTU/HR might equate to $1,100 annual cost of Natural Gas in VA.
What did the Energy Audit indicate?
Size of house and thermal properties are always necessary.
___________ R-values of walls, ceiling and floor.
____________ Window U-value and total area
______________ Infiltration rate (ACH)
NEEDED TO DETERMINE BLOCK LOAD HEAT GAIN /LOSS
Age of residence
square feet per floor
Number of windows and sliding glass doors (or total sq feet) on each floor in each direction...
Ask the firm who installed the systems.
_ _ _ _ _ _ _ ASPT36C14A* 34,200 26,600 14.5 12.0 1,200 5988214
> 14.5 < 16
............../ ~ 15 SEER theoretical.
What's your air flow set-up?...
one would question
AN INDEPENDENT, UNBIASED PRO Dedicated to helping homeowners
achieve a safe, healthy, Clean, COMFORTABLE and Affordable indoor living environment.??...!!!
___________ ONLY ONE BASIC FORMULA
____ Q __ = ___ A * _______ dT / _________ R ______ ... simple stated
Heat Gain = Surface Area * Differential Temperature / Resistance
_________________Time __ Temperature outside ___
_______________________________Temperature inside _ Relative humidity
Downstairs __On___ ____ F _______F _______ _ % R.H....
IF THIS DOES NOT WORK FOR YOU LOCALLY, NOTHING WILL.
" We’ve tried various things. At 72 degrees, the other members of the house are getting a little too warm, but some people are still cold. I’m certainly not warmer. I’ve pushed the thermostat to...
YOU ARE CORRECT.
Last guy comes in LAST.
24,000 BTU/HR ought to be enough for a small-medium size house in So Cal.
MERV 7 Filter is MORE THAN ENOUGH for the Equipment.
Filtration is FOR THE EQUIPMENT, NOT THE OCCUPANTS.
Build yourself an R-40 FOAMED "Igloo" and your heating requirements will be
It should have taken about 3 hours + to recover.
Floor LINEAL FT = about 160 ( NOT 1528).
ACH < 0.25
Sounds like < 2 tons to me..!
PageS 20 & 21
24ANB748 __ TOTAL -SENSIBLE ---_____ CFM -- CFM --- FURNACE ...
It depends on
HOW BIG the Heat Pump is In Relation To the SPECIFIC home thermal building envelope requirements.
Generally between 24'F - 38'F
and obviously where it is actually set.
1,800 sq feet should be < 36,000 BTU/HR at 10'F
Heat Pump Balance Point might be 28'F
Auxiliary heat may be 400 hours times 6...
"After buying/gutting/remodeling our home 2 years ago its finally time to tackle the last project. Current system is all electric Sears units from 1974 with non insulated ductwork that...