Most furnaces hate merv 13 (unless you replace filter box to allow folded filters with far more surface area). They cause a huge pressure drop and likely reduce flow rate enough that there is insuficient airflow and condenser ices up. A separate hepa system, bypass filter or homemade filter box all can work to reduce indoor particulates without hurting furnace operation.
Same in Kawartha Lakes right now, yesterday eve was brutal. If only we had some excess cash, like the 27 or so billion we`ve laundered in Ukraine for what? To make criminal scumbag politicians even more wealthy, that`s what. Not to mention the countless billions pizzed away in the last 11 years. That could handily purchase about 500+ DHC-515 waterbombers. How long before our American neighbors deservedly come at us...again, over forest fire smoke?
Install tech checked with Goodman as that was a prerequisite for my new install. MERV 13 is OK they said but I'll most likely have to change them more frequently to maintain acceptable airflow. I scored a Magnahelic differential pressure gauge from a decommissioned system at work so I installed that and change the filter when the airflow drops (4-6 weeks).
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