A mini-split heat pump makes your home climate consistent without the noise and bulk of traditional window units. You will notice the difference in your comfort levels immediately once the system is installed, which usually takes a professional crew about two days to complete.
Aim to book your contractor in late winter. This is the off-season for HVAC pros, so you are more likely to find availability and potentially avoid the peak-season price hikes that happen when everyone realizes their old unit has died.
Remember that the 0% period is a deadline, not free money. If you have a remaining balance after the 18 months are up, the bank will start charging interest on whatever is left, which will quickly become expensive.