Heat Pump

Working Doc

edit

Calculations

• Coefficient of Performance. Note that the Europeans have a more sophisticated Seasonal COP (SCOP) [1]
• US has SEER - Seasonal Energy Efficiency Ratio[2]
• Heatuing Seasonal Performance Factor - HSPF - [3] - Energy out/ energy in in BTU/W. Ex - 24000 BTU with HSPF 10 means energy use is 2.4kW.
• Cost - note that the above states $7-11k system cost - large value that the owner-builder can create as the hardware involved is only 1/5 of the cost.
• Ground Source - tubing install cost is $13-24k according to above video. Extraction is 10-30W/meter of tubing. Water source heat pump is a bit better, and has extraction of 20-60W/meter of tubing.

Sourcing

• 2 Ton, 21 SEER, $1389, but only to -4F. [4]
• 2 Ton, 21 SEER, $1388, down to -13F [5]
• 2 Ton, 21 SEER, $1788 2 zone - but down to -4F [6]
• 2 Ton 3 zone 21 Seer $2k but down to -4F - [7]
• Senville - 2 ton 1 zone 21 SEER, 10.5 HSPF down to -22F R410 $1480[8]
• Senville Senville SENL-18CD Mini Split Air Conditioner Heat Pump 18000 BTU 19 SEER - Only to 5F
• Mr. Cool DIY only goes from 5F [9].
• Mr. Cool DIY Multizone goes down to -13F [10]
• Mr. Cool Olympus - only 5F [11]
• Mr. Cool Advantage - only 5F
• Blue Ridge - 5F - 1.5 Ton - [12]
• Blue ridge 3 zone -4F 2 ton - [13]
• BLue Ridge -4f - [14]
• Ductless Aire 24000 but 5F min [15]
• 5F - Coliera - [16]

Narrowing Down

• Senville Aura Series - says it's down to -22F and precharged. Senville SENA-24IC-Z 24000 BTU
  • Has heat belt for low temp climates, self-cleaning, self-diagnosing. Lowest temp rating of any heat pump seen so far.
  • Precharged!
  • Has a wall mount for keeping it off the ground.
  • Installation - [17]

More

• 2ton, 9 HSPF, 17 SEER, $1040 [18]. Has outlets for up to 4 heat exchanger units. One unit comes with the basic package. This one needs to be vacuumed and pumped. DIY versio is precharged for $800 extra. You can set it for freeze proof - which keeps your space at 42F.
• Videos for the above:

Winterizing

• Elevate so snow doesn't bury it [19]
• Base pan heaters are recommended for sub-freezing climates - [20]. Different manufacturers sell these for their brands.
• Wind baffles help control the heat exchange in the outdoor unit in cooling mode. [21]

Links

• AC Tonnage Calculator - [[22]]