I guess I'm just trying to say if you are referring to the pressure on the high side of a refrigeration system using the term static pressure is very confusing. The low side pressure of these systems would differ depending on the conditions the system are in. The temperature of the air going over the coil for instance would change the pressure. The static pressure in the ductwork would also be a factor on the operating pressures of the low side.

Consider if every home was heated with a co2 unit. In that case there would be a lot of potential leaks but since it's co2 it's not that big of a concern. The units wouldn't be as efficient but if all our electricity was produced with renewables it wouldn't really matter.

If every unit was R-32 than yes it might be more efficient but leaks could cause some damage to the climate.

Tough to say for sure which one would be better for the enviroment but I think end goal currently should be co2 heat pumps and solar panels on every well insulated house. Don't think we have a better set up enviroment wise right now than that.

I am a red seal refrigeration and AC mechanic with 10 years of experience and I own my own HVAC company. I'd like to think I have a pretty good understanding of heat pumps.

I merely stated the purpose of using co2 over other refrigerants, I don't think you can argue co2 has a much better gwp than alternative gases.

I agree houses should be better insulated first before installing a heat pump. There is no high temp or low temp heat pump, I assume you mean installing a heat pump with higher BTU capacity vs using a smaller system.

A COP of an electric heater would be about 1. I've never heard of a heat pump with that bad of a COP lol.

Surely you know R-22 was considered a better gas than 410-A yet we switched for enviromental purposes. It may be the case that we do it again. It's not that big of a deal and I'm not really sure why you seem to hate the concept so much. Even if a co2 unit is less efficient the net effect on the enviroment is probably going to be positive, especially if we can focus on solar and other clean ways of producing electricity.

R-32 is 675 times worse than co2 in regards to GWP. I would say that is a significant improvement. Also 410-A heat pumps are capable of heating down to -25 C so not really dreadfully inefficient in low temperatures.

Static pressure is usually used in the HVAC world as a measurement of air pressure within ductwork. I'm not sure if you mean the high side pressure of the system in this case maybe?

It's exciting because of the refrigerant that is used. Most modern AC units use 410-A. Switching to CO2 is better in case the unit leaks gas (410 A has much higher global warming potential)