> For the complete documentation index, see [llms.txt](https://docs.ladybug.tools/honeybee-wiki/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ladybug.tools/honeybee-wiki/single-zone-model/assign-properties-to-zones.md).

# Step 1 - Assign Properties to Zones

Assigning Zone Default Properties is the first of several steps necessary for running a simulation. This will also be our entry into Grasshopper and the Honeybee interface. If you are completely unfamiliar with Grasshopper and Honeybee, refer to the Intro sections which cover the basics.

This is an overview of the entire script we will create for a Single Zone Energy Model. This step on Assigning Zone Default Properties covers the portion highlighted in red. If you are following along, be certain that you let Honeybee and Ladybug fly, as covered in Intro III and as visible at the very left of the diagram below.\
![s03\_00\_overview](https://user-images.githubusercontent.com/44324576/51673655-d5129680-1fce-11e9-9f97-66e6f5418b6d.png) Zooming in and reading from left to right, observe that first we will create components that contain the geometry. The geometry is then used to create zones with a default set of properties. Then, the windows are added as children to those zones. ![s03\_00\_overview\_zoom](https://user-images.githubusercontent.com/44324576/51674124-1fe0de00-1fd0-11e9-9e4e-7b7ef4f796be.png)

## Step-by-step

**1.00** First we create a geometry component, and rename it House Zone (refer to **ii.05** if you are unsure how to create components and rename them). We then place the zone geometry constructed according to the guidelines in Step 1 into this component. ![s03\_10\_assign default zones\_\_0000\_step 1](https://user-images.githubusercontent.com/44324576/49189563-1e4bbe80-f36f-11e8-8537-193ce899aa3a.jpg)

Here is an image of the zone which is loaded into this Geometry component, overlayed on top of the model context it represents. ![005\_single zone\_overlay](https://user-images.githubusercontent.com/44324576/49190883-7df89880-f374-11e8-940b-a95f99c58fad.jpg)

**1.01** The Honeybee Masses to Zones component converts the zone geometry into a zone which can be imported into Energy+. As is apparent from the '\_\_' in front of zone Masses and createHBZones, the only two required inputs for this are the zone masses and a boolean toggle to trigger the creation. We only have one zone in this case, so we will save zone naming for a later example with multiple zones.

![s03\_10\_assign default zones\_\_0001\_step 2](https://user-images.githubusercontent.com/44324576/49189556-1db32800-f36f-11e8-8f03-f982dafb3d43.jpg)

**1.02** Honeybee has a library of default settings for Energy+ models that we can choose from. The Honeybee bldgPrograms component allows you to choose from a list of very generic programs. The Honeybee\_ListZonePrograms offers a more detailed list of room types within each of these programs, that each correspond to a set of default settings and schedules for simulation. The Honeybee\_Item Selector allows you to choose one of these sub-programs to connect to the Masses2Zones input for zoneProgram. ![s03\_10\_assign default zones\_\_0002\_step 3](https://user-images.githubusercontent.com/44324576/49189557-1db32800-f36f-11e8-8dde-ff6e9af4d48b.jpg)

**1.03** When a boolean toggle set to True is connected to the create Honeybee Zones input, the Mass2Zones component searches the Energy+ library of default settings for a room type of 'Apartment' within the Building Type of 'MidriseApartment' and applies those schedules to the zone geometry attached to the component. This is a good example of why it is important to have the Honeybee component flying. The Mass2Zones component does not contain all of these default libraries itself, it searches through libraries contained in the Honeybee component and applies the appropriate settings.

![s03\_10\_assign default zones\_\_0003\_step 4](https://user-images.githubusercontent.com/44324576/49189558-1db32800-f36f-11e8-9189-50b314eae95b.jpg)

**1.04** Once zones are created, apply windows as children to the zone. This is done using the Honeybee Add Glazing component (Honeybee-00-Honeybee\_addHBGlz). ![s03\_10\_assign default zones\_\_0004\_step 5](https://user-images.githubusercontent.com/44324576/49189559-1db32800-f36f-11e8-81e2-1f3937621c17.jpg)

**1.05** Create another Geometry component, rename it House Windows and load the following windows into the component. Review **0.07** for geometric requirements for modeling windows. ![005\_single zone\_windows overlay](https://user-images.githubusercontent.com/44324576/51674921-6fc0a480-1fd2-11e9-8834-58054e2c5887.jpg)

**1.06** Then connect the House Windows geometry to the \_childSurfacese input terminal of the Honeybee\_HBaddglz component. As you can see from the other terminals on this component, it is also possible to provide a list of names for these windows and to provide construction details and Radiance Materials for the windows. ![s03\_10\_assign default zones\_\_0005\_step 6](https://user-images.githubusercontent.com/44324576/49189560-1e4bbe80-f36f-11e8-9ff4-e52bf5159263.jpg)

The zones have now been created with default settings and windows. It is time to move on to Step 4. Assigning Climate Data and Selecting Simulation Output.