If It weren't for the HVAC licensing gangster system where armed police would show up and stop me, I would absolutely start a company ripping out whatever broken system you have and with the business model is I would replace it with a small menu of mini split systems I have goons trained to install for cheap.
There is massive pent-up demand for this. Even poor people fix their HVAC system if they have a spare buck. I recently met an elderly lady (yard sale to pay her HVAC bill) who paid $15k, her hearing was shit and she seemed about dead, she wouldn't have given a single shit if it was a little louder. But in any case, I've installed many Daikins (for myself) and for not much more money they are as quiet as the sound of the moving air.
There is massive pent-up demand for this. Even poor people fix their HVAC system if they have a spare buck. I recently met an elderly lady (yard sale to pay her HVAC bill) who paid $15k, her hearing was shit and she seemed about dead, she wouldn't have given a single shit if it was a little louder. But in any case, I've installed many Daikins (for myself) and for not much more money they are as quiet as the sound of the moving air.