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06-22-2007, 11:21 PM #1Regular Guest
- Join Date
- Dec 2006
First Electric Bill on New Goodman
GottyGee, you had to brag. Here's my case study...
Two story home, 3500 sq ft Dallas TX. Equipment 12 years old. Past electric bills - lets not talk about it.
-4 tons downstairs
-5 tons upstairs
-Duct taped ductwork, kinks, excessive duct lengths, no mastic
-Average duct leakage
-Improperly sized & balanced supplies and returns
-Condensers against sun exposed SW brick wall
-5 tons of variable speed Goodman 16 SEER 410A
-10 zones with variable position dampers
-24h Programmable temperature for each zone through web page
-Condenser placed in shade, same SW wall
-New line set per Goodman specifications (1 1/8" & 3/8")
-Engineered R8 Ductwork
The System was installed 5/17/07, after which several days of ductwork followed (air conditioned attic). The total home consumption from 5/17 to 6/17 was:
1462 KWH / 31 days
47 KWH / day
Average high: 86F
Average low: 73F
The occupied rooms have been set to 77F, unoccupied rooms to 87F (unoccupied daytime 5/days/wk). The kitchen and family room never exceed 81F. The 5 Ton Goodman has plenty of capacity to cool the home down from 87F to 77F at the peak hour. If the humidity ever creeps up above a user setpoint (currently used 65% humidity limit) in the occupied rooms, then the temperature set point is automatically lowered by software, resulting in lower humidity (morning hours).
Being Dallas - August will be the true test. The 77F set point has been a very conservative set point, but the zoning and humidity lowered set point assures that the occupied space is always comfortable and the electricity consumption is minimized.
Whats that thing I keep hearing: Properly installed Goodman
Now would be a good time to confess There is a 3HP pool pump running in the back yard; however, it is variable speed, just like the Goodman air handler.