>”They do not work in freezing temperatures.”

They do work in freezing temperatures. In fact you have a heat pump working in your freezer right now. You seem to have just made up this false claim and are now claiming Nature is not a credible source ???

In order for heat pumps to beat current heating sources in terms of emissions they have to function and still be very efficient.

>”They didn't used to be, but what gets published in many journals lately is highly politicized. I'm certain they would not publish an equally valid study that says something different when accounting for more factors. It's a bit off topic but: everything is agenda driven in the world right now because that's where the money is and it's seriously affecting scientific honesty. If nobody gets published for a study discrediting a certain idea then nobody is going to do that study, and even if they did nobody would believe it and/or be aware of it because it wasn't published.”

Source? Sounds like you got lost on your way to r/conspiracy