Respectfully disagree. Modern inverter driven HPs are very quiet (I've worked in HP industry for fifteen years). I'm literally putting one in my own apartment at the moment however my outdoor unit will be in the garden as it's a ground floor apartment.
Depending on whether @revenant. can put anything on outside walls the outdoor unit could be wall mounted too... they're basically just an AC unit (of sorts and size)...
Either or though, you can place the exchanger indoors (they're well suited to being installed in outside corners if you've got one?) and duct it out...
Respectfully disagree. Modern inverter driven HPs are very quiet (I've worked in HP industry for fifteen years). I'm literally putting one in my own apartment at the moment however my outdoor unit will be in the garden as it's a ground floor apartment.
Depending on whether @revenant. can put anything on outside walls the outdoor unit could be wall mounted too... they're basically just an AC unit (of sorts and size)...