Some rooms are always too hot. Tiang tells you which ones, before you build.

Draw your floor plan and Tiang works out how the house behaves: the sun on your roof, the heat coming through your walls, the air in every room, hour by hour, using real weather for where you live.

Other home design apps show you how a room looks. This one shows you how it will feel.

▸ FIND THE HOT ROOM
See every room's temperature through a whole day. Watch the afternoon sun move across the house and see which rooms heat up, which stay cool, and which never cool down at night. Then find out why: the way it faces, the windows, the roof or the insulation.

▸ PICK THE RIGHT AIR CONDITIONER
Tiang works out how much cooling each room really needs, from its size, its walls, its windows and your local climate. So you don't end up with an air conditioner that's too big or too small.

▸ TRY A FIX, THEN RUN IT AGAIN
Swap brick for a lighter wall. Add roof insulation. Move a window. Run it again and see what changed.

▸ WINTER TOO
It works the other way round as well. See where heat escapes, how long a room stays warm after the heating goes off, and how much a better wall or roof would help.

▸ DAMP BEFORE IT BECOMES MOULD
See which rooms are at risk of condensation, so you find the cold corner before the mould does.

▸ AND THE WIFI
See the WiFi signal through your real walls: which room it drops out in, and which wall is to blame.

▸ WHAT IT COSTS TO RUN
Estimate your electricity bill from the house you drew: appliances, lights, heating and cooling. Put solar panels on the roof and see how much they would produce and how soon they would pay for themselves.

▸ WHAT YOU CAN DRAW
- Walls, doors, windows, arches and balconies, all at real measurements
- Several floors, with stairs and your own roof shapes
- Furniture, fans, air conditioners, heaters, lights and wiring
- Walk through the finished house in 3D
- Take a photo of a printed floor plan and Tiang traces it for you
- Metric or imperial
- Works offline. Drawing and saving are always free

▸ WHO IT'S FOR
Anyone with one bedroom that's always the hot one. People building or renovating who want to know how the house will feel to live in. Installers who need to show a client why. Students learning how buildings work.

▸ TAKE IT WITH YOU
Export a PDF with the floor plans, a list of everything in the house and your results, for your builder, a client or your own records.

▸ NO PLAN YET?
Pick a house style and Tiang draws a starting floor plan you can change, then test like any other. (Beta)

▸ ON EVERY DEVICE, TOGETHER
Tiang runs on Android phones and tablets, and on iPhone, iPad and Mac. Sign in and your projects sync across all of them (cloud sync is part of Tiang Pro). You can also invite someone to work on the same house with you.

▸ FREE AND PRO
Drawing, editing and saving are free and unlimited, always. Every month a free account also gets some simulations, a timelapse, a PDF export and a generated plan. Tiang Pro removes the limits, lets you compare two versions of your house side by side, and adds cloud sync and sharing.

Draw it. Then find out how it feels.