Step 1: Basic Information

Where is the house located?

What type of house is it?

Step 2: House Details

When was the house built?

Total Floor Area (in square meters)

Average Ceiling Height (in meters)

Number of Occupants

Step 3: Construction Details

Window Type

Total Window Area (in square meters)

Wall Insulation Quality

Roof/Attic Insulation Quality

Calculation Results

Your estimated HVAC size is:

Required Heating Capacity

Required Cooling Capacity

How We Calculated This

Your total HVAC load is a sum of heat moving through the building's structure and air, plus heat generated inside. Here's the breakdown:

Conduction (Walls, Roof, Windows): Heat moving through solid materials.

Heating Loss:

Cooling Gain:
Infiltration (Air Leaks): Heat transferred by air moving in and out of the house.

Heating Loss:

Cooling Gain:
Internal & Solar Gains: Heat from occupants, appliances, and sunlight. This reduces your heating need but increases your cooling need.

Internal Gains (People/Appliances):

Solar Gains (Windows):

Disclaimer:

This calculator provides a simplified estimate for residential properties. It is intended for informational purposes only and should not replace a detailed analysis by a qualified HVAC professional. Factors like specific building materials, air leakage rates, and local microclimates can significantly affect actual heating and cooling loads.