Checkhouse is a simple app that allows you to calculate and display the winter heat loss by one dwelling. By entering the data relative to the location and geometry of the house, Checkhouse performs a simple calculation and returns results both in numerical and graphical form, eg through which you can understand and see, also as a percentage, the total amount of energy that is dispersed and earned in the winter and also by single dispersing element (walls, windows, ceiling, floor, air spare parts, etc.). The final result is expressed in terms of the energy required from the casing and also in terms of primary energy, giving an energetic class of merit. Thermal bridges are excluded from the calculation. The input data have, in some cases, of the pre-assigned values. Where the data is not present you may add it manually. It's presents an "help button" that helps data entry.