Calculator cluster

HVAC & Energy Calculators

Estimate heating loss, screen mini-split capacity, compare duct airflow and friction, plan loose-fill insulation and model heat-pump running cost.

5 calculators in this cluster

Start with envelope and outdoor-air assumptions before comparing equipment or energy costs. Heating loss, preliminary room cooling and annual useful energy represent different quantities and should not be substituted for each other.

These planning tools expose units, scenarios and model limits. Product-label insulation coverage and manufacturer equipment performance remain separate from a certified building or HVAC design.

A practical calculation workflow

Step 1

Assess the heating envelope

Sum whole-assembly transmission and sensible outdoor-air loss with repeatable surfaces.

Open Heat Loss

Step 2

Compare room equipment capacity

Use a cooling screen or known design loads, then verify actual manufacturer output.

Open Mini-Split Size

Step 3

Check distribution

Compare round and rectangular duct velocity, friction and reverse airflow.

Open Duct Size

Step 5

Plan an insulation order

Use the exact product's coverage row to estimate whole bags and layer depth.

Open Blown-In Insulation

All HVAC & Energy calculators

Choose the variable you know and the quantity you need to solve. Each tool shows its formula, default worked example, and nearby calculations.

Blown-In Insulation Calculator

Calculate blown-in insulation bags, installed and settled depth, coverage and cost from a manufacturer label, with metric and imperial measurements.

Heat Loss Calculator

Estimate room or building heating loss from repeatable surface areas, U- or R-values, outdoor air changes and design temperatures in metric or imperial units.

Mini-Split Size Calculator

Screen mini-split cooling capacity from room area and stated adjustments, or compare known heating and cooling loads with nominal BTU sizes.

Duct Size Calculator

Size round or rectangular ducts by airflow, velocity or straight-duct friction rate; reverse known dimensions to CFM with editable air properties.

Heat Pump Running Cost Calculator

Estimate heat-pump kWh, annual and average monthly running cost from heat demand or runtime, editable COP/SCOP, tariff and auxiliary electricity.

Practical notes