James Murray
  • Woodinville, WA
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James Murray's Discussions

Ductless Heat Pump vs Radiant
11 Replies

Location SeattleWinter design temp 28Heating Degree days 4797Design Temp 80/64South facing with lots of windows u28My question is I have new construction  3000sqft 2 story house. The living room is 2…Continue

Started this discussion. Last reply by Joachim Preiss Feb 24.

Water Water Everywhere
4 Replies

I am new to the business.  Went to a residence that has a mobile home that has an addition and metal roof.  This roof is about 8ft above the original mobile home roof at the ridge and extends passed…Continue

Started this discussion. Last reply by Dennis Heidner Dec 14, 2013.

 

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Ductless Heat Pump vs Radiant

Location SeattleWinter design temp 28Heating Degree days 4797Design Temp 80/64South facing with lots of windows u28My question is I have new construction  3000sqft 2 story house. The living room is 2 story the rest will have a 9 ft ceiling.  I haven't used the ductless and am wondering with the 2 story living room which would be most efficient and comfortable to heat the main living area. My concern is with the 2 story living room the ductless will be less comfortable because all the heat will…See More
Feb 24
Joachim Preiss replied to James Murray's discussion Ductless Heat Pump vs Radiant
"We should mention that Transformations' homes in MA have 12" Double Studded R-45 Low Density Foam Walls and typically not a lot of glazing. An 1,800 sqft home may have two mini-splits on the first floor and one on the second…"
Feb 24
tedkidd replied to James Murray's discussion Ductless Heat Pump vs Radiant
"James, People mistake the effect of stack leakage as stratification.  The distinction is important.  Heat wants to equalize.  Stratification takes energy.  If you do not have large temperature deltas, you will not see the…"
Feb 24
James Murray replied to James Murray's discussion Ductless Heat Pump vs Radiant
"We are a mild climate, tight enclosure. The ductless seems to be very efficient.  My objective is to keep the monthly bill lower but comfort is the most important factor.  With install costs being similar my concern is with the 2…"
Feb 24
Joachim Preiss replied to James Murray's discussion Ductless Heat Pump vs Radiant
"Quality of life is very important to me, and I am trying to convince my customers that 'you get what you pay for'. But each their own and I don't think we're adding value to James' question above. Cheers!"
Feb 23
tedkidd replied to James Murray's discussion Ductless Heat Pump vs Radiant
"4800 seems pretty mild to me. Which do you think impacts efficiency, hdd, or average winter temperature? If you have long mild winters, air source is likely to be more efficient than ground source. I don't know many people willing to throw…"
Feb 23
Joachim Preiss replied to James Murray's discussion Ductless Heat Pump vs Radiant
"James wrote 4800 HDD, which I would not consider a mild climate. Super insulated homes can achieve heat loads so low instead of a geothermal vertical well a slinky can be installed under the foundation at very little cost bringing the price for…"
Feb 23
tedkidd replied to James Murray's discussion Ductless Heat Pump vs Radiant
"Joachim, if you are in a mild climate all the performance risks and capital expense of geo become hard to justify. Air to water should be considered for radiant, and is likely to mean less risk, first cost, and more actual efficiency (not…"
Feb 23
Joachim Preiss replied to James Murray's discussion Ductless Heat Pump vs Radiant
" 100% electric makes it easier to go net zero. A heatpump allows both heating and cooling in one unit, where with a gas/oil boiler/furnace I'd need a separate A/C unit. High efficiency combustion equipment requires regular…"
Feb 23
Orvil D Boyer replied to James Murray's discussion Ductless Heat Pump vs Radiant
"Why 100% electric."
Feb 21
James Murray replied to James Murray's discussion Ductless Heat Pump vs Radiant
"thanks"
Feb 20
Joachim Preiss replied to James Murray's discussion Ductless Heat Pump vs Radiant
"Do you have any need for cooling or dehumidification? If you don't, I don't see that this would be an application for a ductless heatpump.   You're correct that radiant will not create a temperature gradient between floor and…"
Feb 20
James Murray posted a discussion

Ductless Heat Pump vs Radiant

Location SeattleWinter design temp 28Heating Degree days 4797Design Temp 80/64South facing with lots of windows u28My question is I have new construction  3000sqft 2 story house. The living room is 2 story the rest will have a 9 ft ceiling.  I haven't used the ductless and am wondering with the 2 story living room which would be most efficient and comfortable to heat the main living area. My concern is with the 2 story living room the ductless will be less comfortable because all the heat will…See More
Feb 19
Dennis Heidner replied to James Murray's discussion Water Water Everywhere
"Pictures are needed.... but honestly,  I'd walk away.  I live in Seattle area.   If for some reason you need to stay with it and work on it...  you need lots of pictures - for your protection long term, and you need to…"
Dec 14, 2013
Brad Cook replied to James Murray's discussion Water Water Everywhere
"Walk away. To be blunt, in my opinion, if you are asking these questions on this project, you should be starting with less complicated jobs. Manufactured homes are not the same as stick built, although there are similarities. The bathroom vent fans…"
Dec 13, 2013
Stan Kuhn replied to James Murray's discussion Water Water Everywhere
"I can't understand the situation very well, but you noted "propane wall units and fireplace".  I will bet that they are all unvented; burning propane produces a GREAT amount of water vapor into the living space, as well as…"
Dec 12, 2013

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"Nice posts Steven and Eric.   Scale on my combi is a recurring problem.  Attaching…"
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