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Is my HVAC Guy correct? 2 systems instead of 1 system with Dampers
54 Replies

I'll soon be working on converting a second floor of a residential building that was never finished and is being used as an attic for the last 80+ years. Building Size 36'x36', 9 1/2' 1st floor…Continue

Tags: Split, Systems, Movement, Air, Energy

Started this discussion. Last reply by Curt Kinder Nov 9, 2013.

 

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scottscontracting shared James White's discussion on Facebook
Dec 10, 2013
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Dec 10, 2013
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Dec 3, 2013
scottscontracting replied to Jim Gunshinan's discussion Should Homeowners with PV Get Paid Retail or Wholesale Prices for their Excess Electricity?
"Here's a new thick wall construction technique that is eco friendly / sustainable and I feel has the greatest benefits to meet today's building needs.  Since I'm also from a Farming background from North Missouri I welcome anyway…"
Nov 23, 2013
scottscontracting replied to Jim Gunshinan's discussion Should Homeowners with PV Get Paid Retail or Wholesale Prices for their Excess Electricity?
"Any building that still standing as long as those castles have been are/were built to last indeed!"
Nov 23, 2013
scottscontracting replied to Jim Gunshinan's discussion Should Homeowners with PV Get Paid Retail or Wholesale Prices for their Excess Electricity?
"My comment on Storage wasn't 100% meant in re to batteries.  I read lots of info and think that other forms will be available soon-w/ hydrogen being just one. Long ago (1990) while in drafting college, the teacher said: our class would…"
Nov 22, 2013
scottscontracting replied to Jim Gunshinan's discussion Should Homeowners with PV Get Paid Retail or Wholesale Prices for their Excess Electricity?
"When the Renewable Energy storage options are improved everyone will have the options of becoming and not needing to be connected to the grid.  Why waste the $ to improve it now-it will be obsolete in a few years. I should not be…"
Nov 22, 2013
Curt Kinder replied to scottscontracting's discussion Is my HVAC Guy correct? 2 systems instead of 1 system with Dampers
"Sounds about right. In SoFla, heat might be needed just 10-20 days per year with an energy cost of $50-100 In NoFla, heat is needed intermittently in November and March, consistently Dec-Feb."
Nov 9, 2013
tedkidd replied to scottscontracting's discussion Is my HVAC Guy correct? 2 systems instead of 1 system with Dampers
"So in my $1000/$1080 scenario, grid heat would have to cost a couple hundred a year before the reversing valve justified the efficiency loss in cooling..?"
Nov 9, 2013
Curt Kinder replied to scottscontracting's discussion Is my HVAC Guy correct? 2 systems instead of 1 system with Dampers
"I have not; all my residential clients get HP since we have enough of a heating season to justify the expense. I think you could safely figure the efficiency hit at 5-10%"
Nov 9, 2013
Bob Blanchette replied to scottscontracting's discussion Is my HVAC Guy correct? 2 systems instead of 1 system with Dampers
"Not saying we don't need any heat in the 40's, but heat loss is relatively low. Once the furnace has recovered from night setback (we setback for comfort reasons more than saving energy) it's done for the day. We've only started…"
Nov 9, 2013
tedkidd replied to scottscontracting's discussion Is my HVAC Guy correct? 2 systems instead of 1 system with Dampers
"Bob and Curt, sorry my posts left the cascade I know it makes following the conversational thread frustrating and confusing - ipad does not want to reply in line.   Bob: " We have to get down into the 30's before the heat runs…"
Nov 9, 2013
Bob Blanchette replied to scottscontracting's discussion Is my HVAC Guy correct? 2 systems instead of 1 system with Dampers
"EER and SEER do track each other until EER hits about 12-13. EER then stops about 13 while SEER continues to climb. Multistage certainly makes sense for zoned operation. Forcing full output into 1/2 the ductwork rarely will perform…"
Nov 9, 2013
Curt Kinder replied to scottscontracting's discussion Is my HVAC Guy correct? 2 systems instead of 1 system with Dampers
"A 75 degree room may have 77-78 degree air into ceiling returns. Add a bit of duct leakage from a warm attic or garage and 80 is not unreasonable. I will not further quibble with you over SEER parameters - my overall stance is that it is useful for…"
Nov 9, 2013
Bob Blanchette replied to scottscontracting's discussion Is my HVAC Guy correct? 2 systems instead of 1 system with Dampers
"I have a hard time believing a 5 degree increase on return air temp due to ductwork when it's 82 outdoors. You would be looking at a 10F+ increase on 95F days if the ductwork was that leaky. Getting high SEER ratings without increasing EER is…"
Nov 9, 2013
Curt Kinder replied to scottscontracting's discussion Is my HVAC Guy correct? 2 systems instead of 1 system with Dampers
"While I agree that EER is useful, SEER is also useful for comparison. The 80 degree EAT is not intended to reflect thermostat setpoint but instead to compensate for leakage into return air ductwork, AHU's outside conditioned envelope. Everybody…"
Nov 9, 2013

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