HOT2000 logo.

Easy-to-use energy analysis and design software for low-rise residential buildings. Utilizing current heat loss/gain and system performance models, the program aids in the simulation and design of buildings for thermal effectiveness, passive solar heating and the operation and performance of heating and cooling systems.


energy performance, design, residential buildings, energy simulation, passive solar



Expertise Required

Basic understanding of the construction and operation of residential buildings.


Over 1400 worldwide. HOT2000 is used mainly in Canada and the United States with a few users in Japan and Europe.


Builders, design evaluators, engineers, architects, building and energy code writers, Policy writers. HOT2000 is also used as the compliance software for the Canadian R-2000 Program.


Building geometry, construction characteristics (above and below grade), HVAC and domestic hot water specifications, geographical location of the house, fuel costs and economic data (optional). The data is entered through a graphical user interface. Many defaults are provided, if the user is not sure of certain values


Reports on the house analysis, weather file, economic and financial conditions and fuel costs are available. The house analysis includes detailed monthly tables, annual heat loss and HVAC load results. A comparison report allows for the display of results of up to 4 house files at once.

Computer Platform

PC compatible, 486 or higher, Windows 95/NT, SVGA monitor with minimum 800 x 600 resolution.

Programming Language

Calculation engine: FORTRAN, interface: Visual C++


Performs whole-house energy analysis quickly (<1 second on a 486) which can be used to determine annual energy use and help to determine cost effectiveness of energy efficiency upgrades. Takes into account thermal bridging through studs in assemblies, has a detailed air infiltration model and foundation heat loss model. Heat balances are performed on the basement, main floor and the attic. It can model five fuel types and many different HVAC systems (including heat recovery ventilators and heat pumps). Has been validated extensively against hourly simulation programs and monitoring of real houses. The program can be run in English or in French and in metric, Imperial or U.S. units.


Cannot size HVAC equipment room-by-room.



Natural Resources Canada


13th floor
580 Booth Street
Ottawa, Ontario K1A 0E4


(613) 947-0064


(613) 996-9909




Available for download from the web site.