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Filter Pressure Drop Calculator
Loaded filter drop vs the static budget.
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HVAC calculators
Sizing, airflow, efficiency, and heating and cooling costs, each with visible math.
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HVAC Remaining Value Calculator
Remaining value for sale, warranty, or tax calls.
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Repair vs Replace Calculator (5,000 Rule)
The contractor 5,000 rule on your quote.
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Oil to Gas Conversion Calculator
Conversion savings and payback year count.
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Heat Pump Balance Point Calculator
Balance point from load line and capacity lines.
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Heat Pump HSPF Savings Calculator
Seasonal savings from a higher HSPF rating.
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Electric Furnace Cost Calculator
Resistance heat: the baseline everything beats.
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Propane Heating Cost Calculator
Annual propane cost from load, price, and AFUE.
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Dew Point Calculator
Dew point approximation for condensation calls.
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Target Superheat Calculator
Fixed-orifice charging target from wet/dry bulb.
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