Isishisi somoya sizofakwa epayipini eliyindilinga ngemva kwesihlungi somoya esingenayo, ngaphambi kokungena kweyunithi ye-HRV.Idizayinelwe ukuvimbela imodi yokuncibilika, okungukuthi ukugwema ukudala ingcindezi encane engemihle endlini.I-heater ilawulwa yi-thermostat, ishintsha ngaphansi kwamazinga okushisa aphansi angaphandle kuphela.