Since most TwinTemp models are for year round use, the majority of installations are thru-the-wall. Window installation hardware kits can be purchased as an optional accessory. Depending on the model purchased, the following kit would be required:
| Model | Kit Number |
| YQ06J10A | WIKQ |
| ES12J33, EK12J33A, ES16J33, YS09J10, YS13J33 | WIKS |
| EM19J34, EK18J34B, YM18J34A | WIKM |
| EL24J35A, EL33J35, YL24J35A | WIKL |
