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just pulled typical split-system listing in my country: Gree Lomo Arctic R32 Inverter 2022 , about €740 (this is one of the top makers) energy used while cool

just pulled typical split-system listing in my country: Gree Lomo Arctic R32 Inverter 2022 , about €740 (this is one of the top makers) energy used while cooling: 0.7kW energy used while heating: 0.7kW cooling power: 2.7kW heating power: 3kW 4x efficiency, yay! that's what heat pumps do outside temperature from +43C to -25C. i've seen -30C and +48C in some models Also, installation for split units is cheap around here

BeetleB 3y ago
Split units in the US tend to be crazy expensive. When I was shopping for an AC, it was definitely a few thousand more than a regular (central) AC. I know folks in other countries buy it all the time, so it must be cheaper there.
pandaman 3y ago
"Cooling" and "heating" just means the inside coil is colder/warmer than the outside, it does not mean the inside temperature will be comfortable for everyone. Neither while cooling nor while heating.
- out_of_protocol 3y ago
  Could you please explain what you mean? Split system in question is air-air, heat transfers between blocks via special liquid, and warmer /colder air spread through a room via fan. There are no coils. Also, keeping comfortable temperature inside is function of heat loss via walls/windows and effective power of cooling/heating
  - pandaman 3y ago
    The special liquid is running through a system of tubes, called "coils" so it could exchange heat with the air. Keeping comfortable temperatures inside is also a function of the inside coil's temperature, which depends on the special liquid and the compressor. The higher temperature difference between the inside and outside coils, the higher compression is required and lower is the COP. Incidentally, the high inside coil's temperature is also required to heat the air inside at a reasonable rate.
    - out_of_protocol 3y ago
      technically speaking, you can crank up internal fan speed to eleven and get exhaust temperature slightly above current room temperature even if internals are way too hot. regular resistive heaters do that, with their heating elements fired up way past boiling water temperature
      - pandaman 3y ago
        The problem is not the exhaust being too hot, but the heating element being too cold. Gas furnace, for example, burns gas at temperatures much higher than that of boiling water.

BeetleB 3y ago

Split units in the US tend to be crazy expensive. When I was shopping for an AC, it was definitely a few thousand more than a regular (central) AC. I know folks in other countries buy it all the time, so it must be cheaper there.

pandaman 3y ago

"Cooling" and "heating" just means the inside coil is colder/warmer than the outside, it does not mean the inside temperature will be comfortable for everyone. Neither while cooling nor while heating.

out_of_protocol 3y ago
Could you please explain what you mean? Split system in question is air-air, heat transfers between blocks via special liquid, and warmer /colder air spread through a room via fan. There are no coils. Also, keeping comfortable temperature inside is function of heat loss via walls/windows and effective power of cooling/heating
- pandaman 3y ago
  The special liquid is running through a system of tubes, called "coils" so it could exchange heat with the air. Keeping comfortable temperatures inside is also a function of the inside coil's temperature, which depends on the special liquid and the compressor. The higher temperature difference between the inside and outside coils, the higher compression is required and lower is the COP. Incidentally, the high inside coil's temperature is also required to heat the air inside at a reasonable rate.
  - out_of_protocol 3y ago
    technically speaking, you can crank up internal fan speed to eleven and get exhaust temperature slightly above current room temperature even if internals are way too hot. regular resistive heaters do that, with their heating elements fired up way past boiling water temperature
    - pandaman 3y ago
      The problem is not the exhaust being too hot, but the heating element being too cold. Gas furnace, for example, burns gas at temperatures much higher than that of boiling water.