I had a new Carrier heat pump HVAC with a two stage blower installed and it has it's own expensive filter which they said it's good for 12 months.
My old HVAC system, I used a separate thin filter installed on my cold air return vent from ACE and I changed it every 3 months.
I can buy one and get one free on sale at aprrox. $3.50 a filter.
Carrier HVAC filter sell for $50.00 and $80.00 on Amazon.
My question is, should keep using the ACE filter or the one on the unit itself?
Using the thinner standard filter, will it effect the warranty?
I was told not to use both filters from the installer at the same time.
Of course, the Carrier dealer said the filter that came with it is much better filter.
What would you do?