re: Any HVAC folks can help identify my system?

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Not willing to buy anything favorite right now because house is still a demolition zone and the filters are getting clogged with drywall dust. Once everything settles down I'll see what I can find.

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I had my entire flooring in the house replaced last year and I was nearly having to replace my HVAC filter daily - what a mess.

I would caution you though, when all that work is done and the house clean, I would not recommend using a 1 inch high MERV pleated filter in the return grill - they greatly increase static pressure (resistance to air flow) and can cause equipment issues down the road.

The professional HVAC forums I follow, techs hate big box store high MERV Filtrete filters for this reason and don’t recommend them although it’s good for their HVAC repair business. The filters primary function is to protect the equipment, not improve IAQ for the occupants. But it’s OK to use those high MERV filters now while the construction is on-going to insure your evap coil doesn’t get coated with construction dust.

As for the filters....
24x36 would be the same as installing two 24x18. You should be able to find a 24x18 filter at most places that sell A/C filter.

2 or 3 years ago, the price of A/C filters really went up. I "invested" in buying a case of filters from Amazon. My A/C unit uses a 24x24 filter which is sometimes hard to find.