Estimates, not engineering. Every result on this site is an estimate from a simplified load model. Real buildings vary — construction quality, infiltration, duct losses, glazing and microclimate can move the true load substantially.
Central systems require Manual J. US residential code requires equipment sizing per ACCA Manual J/S. Use our numbers to sanity-check quotes and shortlist options, not as a substitute for a contractor's load calculation.
Electrical results are informational. Ampere, MCB and breaker figures assume typical efficiencies and clean supply. Wire gauge, breaker selection and installation are the responsibility of a licensed electrician following local code and the manufacturer's data plate.
Reference values age. BEE ISEER star bands, SEER2 minimums, tariffs and electricity rates change over time. Cross-check current official tables before purchase decisions.
Model number decoding. Nomenclatures vary across model years and ranges; the data plate's rated capacity is always authoritative over a decoded model number.