Cottage insulation varies more than you think
Log cabins, older lake camps, and part-time cottages often perform like "poor" insulation even when charming. Select insulation level honestly in the calculator — not what you wish the camp had.
600 sq ft cottage with average insulation often calculates 15,000–18,000 BTU. A single 18,000 BTU head works for open main floors; upstairs/downstairs splits may need two heads or multi-zone.
Seasonal vs year-round use
- Seasonal summer cooling: size for peak July load; dehumidification matters at the lake
- Shoulder-season heat pump heat: check HSPF and low-temp performance rating
- Winter away mode: set heat to 45–50°F or follow manufacturer winterizing in freeze zones
- Mice and pest protection on line sets and condenser covers during vacant months
Single head vs multi-zone cabins
Open great-room cottages with one sleeping loft often work with one head in the main space. Closed bedroom doors on a second floor usually need a second zone.
Compare equipment cost vs comfort — one oversized head blowing cold air under closed bedroom doors leads to complaints every weekend.
Lake cabin humidity and shoulder seasons
Cottages at the lake see high humidity in June — dehumidification matters as much as raw BTU. Right-sized inverter units run longer cycles and pull moisture better than oversized singles.
Shoulder-season heat (50–40°F outdoor) needs a heat pump with published low-temp performance. Check HSPF2 and extended capacity tables before relying on ductless as sole heat source.
Run the cottage mini-split calculator with "poor" insulation first if the camp is older, then model upgrades to see BTU drop.