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Ductless mini splits, also called mini split AC heat pumps, deliver energy‑efficient heating and cooling without ductwork, making them ideal for homes, apartments, additions, and workshops. A compact outdoor condenser connects to one or more indoor air handlers, providing quiet, zoned comfort and lower utility bills year‑round through heat pump technology.
These systems shine with benefits homeowners and pros value: precise temperature control per room, quiet operation, dehumidification, and flexible placement. Modern inverter compressors ramp up and down to match demand, boosting SEER2 and HSPF2 ratings and cutting energy waste. Many models add Wi‑Fi control, smart home integration, sleep modes, and air filtration.
Choose from single‑zone or multi‑zone packages and from wall‑mounted, floor‑mounted, ceiling cassette, or concealed duct units. Key specs to compare include BTU capacity, efficiency ratings (SEER2/EER2/HSPF2), low‑ambient heating performance, sound levels, voltage (115V/230V), maximum line‑set length, and warranty terms.
Sizing matters. A quick rule of thumb is 20–30 BTU per square foot, then adjust for insulation, sun exposure, ceiling height, windows, and climate. For best results, request a Manual J load calculation. Place the indoor head with clear airflow and route the line set; plan for a condensate drain or pump. DIY‑friendly kits with pre‑charged lines exist, but licensed installation protects performance and warranty.
Expect higher upfront cost than window units, offset by efficient operation and potential rebates or tax credits for ENERGY STAR certified heat pumps. Maintain performance by washing filters monthly, keeping the outdoor unit clear, and scheduling periodic coil cleanings. Check local building code requirements first.
Popular uses include bedrooms, living rooms, home offices, basements, garages, server closets, and ADUs. Noise levels often range from 19–45 dB(A), far quieter than window ACs.
Shopping checklist:
- Capacity and number of zones
- Cold‑climate rating and efficiency
- Noise, airflow, and filtration
- Controls and features
- Installation method and warranty