LTR Tool — Is Your Building Heat Pump Ready?

01 — Building & Location

Building type

Climate zone

Project type

Renovation New build

Enter custom geometry?

Use defaults Enter values

Net floor height m

Net floor area (living area) m²

Roof area (opaque) m²

Façade area (excl. windows) m²

Total window area m²

Floor slab area m²

02 — Thermal Envelope (U-values)

Wall U-value W/(m²K)

Roof U-value W/(m²K)

Floor slab U-value W/(m²K)

Window type

03 — Ventilation

Free ventilation rate 1/h

Infiltration rate 1/h

Mechanical ventilation system?

No Yes

04 — Heating System

Space heating system

Efficiency class

Set point temperature °C

Internal heat gains W/m²

Low-Temperature Readiness Status

—

Space heating energy need
kWh/m²a (useful)

—

Final energy delivered
kWh/m²a

—

System SCOP
(seasonal efficiency)

—

Peak heating load
kW

Energy need vs. thresholds for selected climate zone

0 — — 220 kWh/m²a

Possible improvement measures

Façade insulation — reduces wall U-value by ~60% Cavity wall insulation — reduces wall U-value by ~50% Roof insulation — reduces roof U-value by ~60% Floor slab insulation — reduces slab U-value by ~55% Window replacement — upgrade to triple glass (U: 0.6) Hydraulic balancing — up to 10–15% savings on heating demand

✓ LTR Status obtained with selected measures

LTR ToolIs Your BuildingHeat Pump Ready?

LTR Tool
Is Your Building
Heat Pump Ready?