i have NH TZ-25 with rear blower that i have used for last 3 years. it spends time in both my unheated detached garage or heated attached garage with no problems. i try to keep everything well greased. i try to bring it in to the attached garage if i know there is a big snow coming or if it is going to be very cold (often below -20 celsius here). often after blowing driveway i will leave it in the heated garage for a few hrs just to let everything melt off then put it back out in the unheated garage. have had no issues either way.