Home Planner · 1930s Semi
A 1930s semi, read as one.
The bay window, the unfilled cavity walls and a generous loft above; each part of a 1930s semi shapes the others, and the planner reads the whole house rather than the parts in isolation.
Open the plannerHow the planner thinks
A whole home on a cold morning, drawn as one connected envelope rather than a set of separate rooms.
It reads the whole house first
Heat, air and moisture move between rooms whether you ask them to or not. Every selection you make is scored against the rest of the home, not in isolation.
It prioritises fabric before kit
Insulation, shading and draughts go in first; only then does a heat pump or an AC unit need to be specified. The order is what keeps the numbers honest.
It surfaces the best next move
After two or three selections, the planner names the single change that would move comfort, bills or air quality the most from where you are now.
Stage 1 · Explore
Stage 2 · Try improvements
Tap a room on the house to begin.
Your home
Pick the one that looks closest. The page adjusts quietly.
Cooling rarely needs the whole house. Start with the rooms that overheat first; bedrooms upstairs and the south-facing living room are usually where the discomfort lives.
Stage 3 · Read the answer
If this were our house
For a 1930s semi with cavity walls unfilled
We would insulate the loft to at least 300mm and fill the cavity before pricing a heat pump. Together those two moves usually cost less than a tenth of the heating system and they change the size of the unit you need.
Only then would we open the Heat Pump Sizing engine, and only then would the number it produces be worth acting on.
Transparency
How we calculate this.
Last reviewed · June 2026
Method
Each improvement contributes an illustrative installed range and a comfort, energy or air quality delta, scaled by your property type. The recommendation engine reads the current selections and orders the most useful next move, with insulation prioritised before sizing a heat pump and storage prioritised after a credible solar plan.
Sources
- Energy Saving Trust; home improvement guidance and typical savings
- MCS Foundation; certified installer data and typical install costs
- Ofgem; UK electricity and gas price cap figures
Assumptions
- Electricity price
- 27p / kWh
- BUS grant applied to heat pumps
- £7,500
- Solar yield
- 850 kWh per kWp
- Source
- Illustrative
Your Home Climate estimates are independent and indicative. They are designed to inform decisions, not replace a survey. Numbers can shift ±15–25% depending on installer, site access, and specification.