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Quality assurance for 75,000 BTU propane furnace; downflow Explained to homeowner how to buy and replace (2) 18x20x1 filters. Replace every (3) months. When I arrived PSC fan speed taps were HEAT: BLUE MED LOW; COOL: RED LOW. Used manufacturers airflow chart and static pressure to determine that HEAT and COOL should both be set to YELLOW: MED HI. Measured temperature rise. (75-125=45°F) Measured temperature split in cooling mode while using charging jacket on AC (72-52 =20°) Inspected all aspects of install ensuring that quality standards are set. Combustion and draft tests: Pass Put manufacturer’s literature in service record. Quality assurance passes. Always check fan speeds and manufacturers airflow chart for the equipment you are working with including AC speeds even if you are replacing only.