Electronics & Appliances Best Posts in Thread: AC or heat pump?

@cabb
Daikin makes a 3 zone system for home use.
https://www.daikin.com.ph/products/room-air/multi-split-type/

No experience with heat pumps at all. No experience with multi zone systems.
My place has two Daikin inverter/split type air conditioners.
My experience with Polaris has always been good and they actually had the part in stock for a repair I needed.
At some point I expect spare parts may not be available so I'll be able to scavenge spare parts from one of the units when it eventually fails. You might want to consider that strategy.

Slightly off topic but; I had a two year old Samsung washing machine which blew its control board. "Sorry sir no spare parts no longer in production". The repair tech p!ssed me off "sir since your washing machine looks brand new we can negotiate a partial refund from Samsung for you". We declined as the offer sounded shady. Two weeks later the tech called to announce he had found the required control board.
Anyway spare parts here is a concern and having 3 identical units is the strategy I would consider.

 

I have my windows open 24/7 got use to the noise, my ceiling fan drowns most of the noise anyway, sounds like a chopper taking off.

 

This might be helpful.
https://101appliance.com/how-to-find-the-proper-aircon-capacity-for-your-room-size/

Room Size Capacity (kJ/hr) Estimated HP Rating
≤ 10 sqm. 5,000 0.5 HP
10 - 15 sqm. 5,000 - 7,500 0.75 HP
15 - 19 sqm. 7,500 - 9,500 1.0 HP
19 - 25 sqm. 9,500 - 12,500 1.5 HP
25 - 35 sqm. 12,500 - 17,500 2.0 HP
35 - 43 sqm. 17,500 - 21,500 2.5 HP

From the article, "Aside from kJ/hr and BTU, an aircon’s capacity can also be measured in horsepower (HP). However, HP is used to measure the motor’s power, not the aircon’s cooling capacity. That is to say. different models with the same horsepower rating may differ in their cooling capacity."

After pondering this I'm thinking that HP is not the best way to describe cooling capacity.
Not all motors are equally efficient. 1hp 110v motors are normally less efficient than 1hp 220v motors. Sorry, I'm using the US voltages I'm familiar with. Both can create 1 HP of mechanical force but 220v will use less current to do so, making it more efficient. That is not entirely why I think this though.
Thinking back to when the US auto industry switched from R12 to R134a, the condenser and evaporator increased in size, the compressor pressure output increased. The r134a compressor takes more HP to operate than the r12 compressor did, to achieve the same cooling capacity.