HVAC tools
Size units and ducts for any space.
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HVAC Quote Builder
Price equipment and labor into a professional PDF quote.
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HVAC Invoice Builder
Invoice a job — or turn a quote into an invoice.
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HVAC Purchase Order
Order equipment from suppliers as a branded PDF purchase order.
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HVAC Job Card
Log on-site work, parts and hours — sign-off ready.
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HVAC Load & AC Tonnage Calculator
AC tonnage and cooling load for a room.
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Duct Sizing Calculator
Duct dimensions for a target airflow.
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Ventilation Calculator (ACH)
Airflow needed from air changes per hour.
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Heating Load Calculator (BTU)
BTU/kW needed to heat a room.
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Aircon Running Cost Calculator
What an aircon costs to run per day and month.
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Superheat & Subcooling Calculator
Charge-check targets from pressure and temperature.
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Refrigerant Line Set Charge Calculator
Extra refrigerant to add for a longer line set.
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BTU / kW / Ton Converter
Convert between BTU/hr, kW and tons of refrigeration.
Open toolExequtechOS
Do the whole job in one place
A calculation is just the start. ExequtechOS takes it from estimate to quote, job card, invoice and paid — for your whole team.
Get started with ExequtechOS- Turn these numbers into a client-ready quote
- Job cards, invoicing & inventory in one place
- Works offline in the field, syncs when you’re back