Start with the model’s own operating instructions
Keep the owner’s manual or model number where you can find it. The controls and filter-care instructions vary by system, so use the directions for your unit instead of assuming every heat pump needs the same setting or cleaning interval.
The Maine Department of Energy Resources’ 2026–2027 Winter Heating Guide recommends keeping heat pumps clean and maintained, and links to Efficiency Maine’s heat-pump user tips. Use those as general state guidance alongside the directions for your equipment.
Notice outdoor conditions without disturbing the unit
When snow or debris builds up near outdoor equipment, make a safe visual check of the area and consult the manufacturer’s clearance instructions. Do not chip at ice, push snow against the cabinet, or remove panels to investigate.
The U.S. Fire Administration separately advises keeping household vents such as a furnace vent clear of snow and debris. A furnace vent is not the same as a heat-pump outdoor unit, so follow the correct equipment instructions for each.
Keep a simple record of a performance change
If a room stops reaching its usual comfort level, note the date, outdoor conditions, affected rooms, control setting, and anything shown on the display. With multi-zone equipment, record which indoor units still appear to work normally.
- Equipment make and model, if visible
- Rooms or zones affected
- Any message displayed by the controls
- Recent maintenance or changes to the space
Know when to request professional diagnosis
Recurring shutdowns, visible damage, unfamiliar sounds, persistent water, or a control error are reasons to stop guessing and ask for equipment-specific diagnosis. Do not open electrical compartments or handle refrigerant tubing.
Public guidance
These government publications are the sources cited in this guide. Equipment-specific instructions may differ.