davidkoperty

Using multiple mini-split style outdoor units with conventional air handlers can still deliver good temperature differentials similar to traditional big-box systems if properly sized, and consistent airflow is maintained. The Frigidaire FFPA1422U1 use and care manual highlights tips for efficient operation, maintenance, and troubleshooting to ensure optimal cooling and energy efficiency, which applies well when integrating new configurations like this, keeping systems balanced and performing as expected.

It sounds like you’ll likely need properly sized Category 1 (B-vent or C-vent) metal flue pipe, sized to handle both the 100,000 BTU fan-assisted furnace and the 40,000 BTU water heater with minimal bends, and installed per NFPA 211 clearances, but confirming exact diameters and configuration with an HVAC professional or local code inspector is essential before final purchase.

Nice topic!

Do you know if the air handlers are properly matched to the mini-split outdoor units’ capacity? Generally, as long as the system is correctly sized and balanced, the temperature differential should be similar, but mismatched components or long duct runs can reduce efficiency and airflow.