What's the limiting parameter here? Obviously heat pumps can be scaled up to arbitrary sizes - I've used unimaginably large ones in the chemical industry. Do you mean power vs cost compared to other options? Power vs volume? Power vs. weight?
Stockholm has a couple 40 megawatt heat pumps as part of a set of just seven heat pumps which provide building heat to an entire district of the city, pumping heat through 3000 kilometers of pipes.
The only limiting factor I'm aware of for most commercially-available home heat pumps is that they tend not to work well below a certain temperature. This minimum temperature can be lowered by increasing the size of the outdoor radiator and adjusting the pump and coolant pressures to match.
What's the limiting parameter here? Obviously heat pumps can be scaled up to arbitrary sizes - I've used unimaginably large ones in the chemical industry. Do you mean power vs cost compared to other options? Power vs volume? Power vs. weight?
Stockholm has a couple 40 megawatt heat pumps as part of a set of just seven heat pumps which provide building heat to an entire district of the city, pumping heat through 3000 kilometers of pipes.
The only limiting factor I'm aware of for most commercially-available home heat pumps is that they tend not to work well below a certain temperature. This minimum temperature can be lowered by increasing the size of the outdoor radiator and adjusting the pump and coolant pressures to match.