3 ms·

A portable machine to provide heat and cooling via heat pump technology. For cooling this exists in many forms: there are the window air conditioners, and "por

A portable machine to provide heat and cooling via heat pump technology. For cooling this exists in many forms: there are the window air conditioners, and "portable" window air conditioners which have a duct that connects to the window. The problem with the latter is that they're loud and the ducts result in a lot of heat loss. For heating there are some portable air conditioners that use a heat pump but they're subject to the same issue described above. More common is resistive electrical heat in the form of coils or an oil filled container that radiates heat. A portable mini split, where it connects through the window would give you a similar advantage as a portable air conditioner, but with more efficiency and being less loud.

bilsbie 4y ago
Cool idea. So a two piece portable with a just coolant line going through the window to the outdoor part?
- endisneigh 4y ago
  yeah, exactly. there's a company called MRCOOL that does something similar (https://mrcool.com/diy-4th-generation/ https://mrcool.com/diy-4th-generation/), but the head (the indoor part that provides the heat/cooling) is designed to be mounted permanently if this were popular you'd see old houses retrofitted with pluggable holes where you could feed the lineset through and seal as necessary for temporary heat/cooling, or perhaps even permanent. the installation would be substantially easier if these were like 6000BTU instead of minimum 12000BTU per head, so it could be run on say, ~8 amps and be plugged inside.
- aaronax 4y ago
  Coolant supply and return, both fully insulated. And condensate drain line, and power wires, and control wires. Do-able, but more complex than one might initially think.
sparsely 4y ago
I believe you are describing something like this: https://mrcool.com/u-shaped-window-a-c/ https://mrcool.com/u-shaped-window-a-c/ Never used one myself but they are meant to be much better than the ones with ducts - you don't lose so much efficiency from the ducts or from badly patched up window openings.
almuhalil 4y ago
There is a portable mini-split that recently came onto the market, and its form factor is similar to that of a window AC: https://www.gradientcomfort.com/ https://www.gradientcomfort.com/ The only problems I can see are: -Size/Price ratio: The tonnage (9,000 BTU) is relatively low for its price--it can only condition a ~375 sq foot space. Though the lack of install costs probably makes up for this unless you're doing a DIY job with a Mr. Cool Ductless HP. -Incentives: Utilities may not want to spend energy efficiency incentive dollars on these, since someone could easily move and take the heat pump outside of the utility territory; which is not a problem with permanent HVAC installations. Might be covered by the IRA's rebates for Heat Pumps though.

bilsbie 4y ago

Cool idea. So a two piece portable with a just coolant line going through the window to the outdoor part?

endisneigh 4y ago
yeah, exactly. there's a company called MRCOOL that does something similar (https://mrcool.com/diy-4th-generation/ https://mrcool.com/diy-4th-generation/), but the head (the indoor part that provides the heat/cooling) is designed to be mounted permanently if this were popular you'd see old houses retrofitted with pluggable holes where you could feed the lineset through and seal as necessary for temporary heat/cooling, or perhaps even permanent. the installation would be substantially easier if these were like 6000BTU instead of minimum 12000BTU per head, so it could be run on say, ~8 amps and be plugged inside.
aaronax 4y ago
Coolant supply and return, both fully insulated. And condensate drain line, and power wires, and control wires. Do-able, but more complex than one might initially think.

sparsely 4y ago

I believe you are describing something like this: https://mrcool.com/u-shaped-window-a-c/ https://mrcool.com/u-shaped-window-a-c/ Never used one myself but they are meant to be much better than the ones with ducts - you don't lose so much efficiency from the ducts or from badly patched up window openings.

almuhalil 4y ago

There is a portable mini-split that recently came onto the market, and its form factor is similar to that of a window AC: https://www.gradientcomfort.com/ https://www.gradientcomfort.com/ The only problems I can see are: -Size/Price ratio: The tonnage (9,000 BTU) is relatively low for its price--it can only condition a ~375 sq foot space. Though the lack of install costs probably makes up for this unless you're doing a DIY job with a Mr. Cool Ductless HP. -Incentives: Utilities may not want to spend energy efficiency incentive dollars on these, since someone could easily move and take the heat pump outside of the utility territory; which is not a problem with permanent HVAC installations. Might be covered by the IRA's rebates for Heat Pumps though.