HVAC & Energy Calculators — Heat Pumps, Furnaces, Filters | ProCalcHub

All HVAC & Energy calculators

HVAC

Air Filter Actual Size Calculator

Nominal vs actual filter size.

HVAC

Dual Fuel Switchover Temperature Calculator

Heat pump or furnace balance point.

HVAC

Furnace Filter Yearly Quantity Calculator

How many filters to buy a year.

HVAC

Heat Pump vs Gas Furnace Cost Calculator

Compare yearly heating costs.

HVAC

HVAC Repair vs Replace Calculator

Fix the furnace or AC, or replace?

Heating and cooling decisions with real numbers

Heating equipment choices come down to energy prices, efficiency and age. These calculators turn COP, AFUE, lifespans and filter intervals into transparent comparisons you can adjust to your own bills and quotes.

Results are planning estimates. Final sizing and installation must follow the codes adopted where you live and be confirmed by a licensed professional.

Frequently asked questions

Are these HVAC load calculations?

No. They compare operating costs and equipment decisions. Sizing a system requires a room-by-room load calculation (such as Manual J) by an HVAC professional.

Which prices should I use?

Use the marginal price from your own recent bills — total charges divided by kWh, therms or gallons — for the most realistic comparison.

Other categories

Choose a category to find the right calculator for your needs.

Business & Finance

Loans, taxes, ROI and more.

Electrical & Power

EV chargers, circuits and generators.

Plumbing & Water

Softeners, hardness and water heaters.

Home Improvement

Materials and home project planning.

Moving & Storage

Storage units, junk removal and packing.

Commercial Operations

Cleaning, kitchens and facilities.

Unit Conversion

Convert units instantly.

Math & Algebra

Solve and calculate faster.

Date & Time

Work with dates and time.

Health & Fitness

Track your health and wellness.

Text & Data

Count, convert and format text.

Special Calculators

Event planning and one-off questions.