Hot2000 functions by allowing users to create a detailed digital model of a residential building and its energy-related components. The software then uses this model to simulate and predict the energy consumption and performance of the building under various conditions. Here is a general overview of its functioning:

1. Data Input: Users input detailed information about the building's geometry, construction materials, insulation, windows, doors, HVAC systems, and other relevant components. This involves specifying characteristics such as dimensions, materials, thermal properties, and performance details.
2. System Configuration: Users configure the heating, cooling, ventilation, and air conditioning systems within the building. This includes specifying the type of HVAC equipment, their efficiency, and operational settings.
3. Simulation Setup: Once the building data and systems are configured, users set up simulation parameters, such as the climate data, occupancy patterns, internal loads, and other relevant variables that affect the building's energy consumption.
4. Dynamic Simulation: Hot2000 conducts dynamic energy simulations using the provided data and parameters. It calculates the building's energy usage over time, considering the interactions between various components and their response to changing conditions like weather and occupancy.
5. Results and Reports: After the simulation runs, the software generates comprehensive reports detailing the building's energy consumption, demand, costs, and other performance indicators. These reports provide insights into the effectiveness of the building's design and energy systems.
6. Analysis and Optimization: Users can analyze the simulation results to identify areas for improvement or energy-saving opportunities. They can then test alternative scenarios or design changes within the software to optimize the building's energy performance.
7. Compliance Checking: Hot2000 can also assess whether the building design complies with energy codes and standards, providing an indication of the building's energy efficiency and its adherence to regulatory requirements.

Overall, Hot2000 functions as a tool for energy modeling and analysis, enabling users to evaluate the energy performance of a residential building, make informed design decisions, and ensure compliance with energy standards and regulations. The software's simulation capabilities provide valuable insights into the building's energy efficiency, allowing users to optimize design choices for more sustainable and energy-efficient structures.