At the Zone level of the Building Tree, an input is provided for the Story of the building the Zone is assigned to.  In that list, each Story is required to have a unique name that describes the particular Story.  As an example, Floor 2 could be used to describe the second story of the building. Zonal type systems such as Water Source Heat Pumps, Packaged Terminal Air Conditioners and Heat Pumps and Four Pipe fan Coil systems cannot be configured to serve more than one HVAC zone given the limitation of the thermostat controls.  The CEC CBECC engine enforces this rule. Highrise Residential occupancies are mandated to have ventilation systems by the code (balanced, exhaust or supply).  These ventilation systems must be input at the Zone level of the Building Tree, Mechanical tab, in the Ventilation box.  Note that the HVAC system itself cannot provide the ventilation, although it could be provided by a Dedicated Outside Air System that feeds to the HVAC.  Each dwelling must be provided with ventilation according to the following formula: CFM = Floor Area X 0.03 + (NBedrooms + 1) X 7.5  (NBedrooms cannot be less than 1). The calculation engines in EnergyPro that are now used for Title 24 code compliance are developed and maintained by the California Energy Commission. Consider naming the construction to match what the builder will be constructing rather than what you modeled (e.g., call the R-30 wood-framed roof/ceiling with 0.032 U-factor that is substituting for your R-38, 0.031 U-factor, roof. In the System element, create a HVAC system with the appropriate system type and ‘Hot Water’ as the heating type. Verify the total capacity of each outdoor condenser unit that has been input at the System level of the building tree. Please do not send in your file with a request that we diagnose this issue, it is not something that we can provide as a normal support service.  One route you may wish to consider would be submitting Prescriptive Mechanical documentation instead, since that approach does not have this requirement. Below is a list of tabs in which you need to enter information for a residential title 24 calculation. This zone will have a thermostat that will control the HVAC operation and cannot be input as an unconditioned zone. Each floor of the building will require this value be input.     Their website is If you wish to make this a ground coupled system (geothermal), at the Plant level of the Building Tree, Hydronic tab, check the box for Ground Coupled. (NOTE: Because a radiant barrier requires a 1-1/2″ air space, when roof deck insulation is modeled uncheck the radiant barrier option.). How to check the DOE files for a cause of a crashing file: Why am I getting all zeroes in my results? Your other option is to select the Calculations on the lower left. Refer to the Residential Compliance Manual for details on how this would be accomplished, along with insulation details. Yes, since all single family buildings regardless of number of stories are considered low-rise residential, you can use do this (the three-story limit does not apply to Occupancy Group R-3). For starters you must consider a Heat Pump as the source of heating, using electric resistance heat if not going to comply. When an Overhang or Sidefin has been specified on a window in a given wall, it is a requirement that a complete set of inputs for the wall, and all surfaces in that wall (windows and doors) be provided. At the System level of the Building Tree, you have specified HVAC systems that include chilled water coils.  You have not input a chiller to serve these coils at the Plant level of the Building Tree. To fill out the tables in the LEED documents, please reference the EAPs and EAP2 reports from the EnergyPro Report selections. This may cause an inaccurate zone heat balance calculation. You have the option of inputting spaces as Residential garages. New, Altered or Existing. Note that if you have both windows and skylights using the same fenestration entry, you will need to create two entries in the library, one for windows, another for skylights. At the System level of the tree, select the HVAC system. As an alternative, go to the Hydronic tab and select the Cooling Tower and raise the Setpoint of the Cooling Tower above the boiler setting. Without this input, the software does not know what this surface is next to. The Floor to Floor Height for the Zone can never be less than the Ceiling Height. To fix this, click on the Zone in the Building Tree, click the entry for Story and change the Floor Multiplier to 1. Now click on the Edit option and see what weather file location is specified. In the Building Tree, navigate to the System level of the tree and click on the Existing System which is undefined and select a valid system from the Central System library. If you have entered Week Periods in the utility rate incorrectly, your file will crash.  Week Periods need to be is chronological order, starting on Jan. 1st and ending Dec. 31st.  The month and day is the ending day for that period.  So the top line starts on Jan. 1st and ends on the date entered.  The next line down starts on the day after the previous period ends.  The last period needs to end on Dec. 31st.  See the screenshot below. Double check that you have entered this value correctly by selecting the HVAC system in the System level of the Building Tree and reviewing the inputs in the heating and cooling tabs. At the Zone level of the Building Tree, Mechanical or Dwelling Units tab, please review your inputs for the ASRE and SRE ratings. When modeling conditioned spaces under Title 24, all spaces are required to be ventilated per the code.  At the Zone level of the tree, in the Mechanical tab, you have set the Ventilation to Natural Ventilation.  The Natural Ventilation choice is only valid in the software for Hotel/Motel Guestrooms (2016 Title 24 also allows it in Highrise Res) and cannot be used for other occupancies.  This setting needs to be change to either a  Ducted HVAC System, or to an Exhaust Fan. Simple as possible changes I need to re-register the project from the piano 's! 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