HVAC calculators & guides
Free hvac tools and plain-English guides for New Zealand — each gives the answer fast and shows the working behind it.
About hvac calculations
Heating and cooling calculations answer one core question in different costumes: how much thermal energy does this space gain or lose, and what equipment moves that much heat? Room dimensions, insulation, climate and occupancy feed the load; the load drives equipment sizing; and oversized equipment is just as real a problem as undersized — it cycles on and off without ever dehumidifying or running efficiently.
The HVAC tools here cover the recurring arithmetic: thermal loads, airflow, and capacity conversions between the units the industry mixes freely. Each shows its inputs and working so you can see exactly which assumptions drove the number.
Using the results
A quick calculation is a planning tool, not a substitute for a full load calculation on a real building. Use these results to budget, compare quotes, and ask sharper questions — and treat a contractor's properly measured load calculation as the final word for equipment you'll live with for fifteen years.