Best Cold Weather & Bloody Knuckles Integrated Amp

Need a new garage integrated amp. Something that can survive -15f to 105 f weather swings, similar large swings in humidity and that does not have large cooling vent holes that attract the occasional mud dobber. Maybe 50 - 100 wpc & fairly cheap. Any suggestions appreciated. The old Marantz equipment used to be just the ticket, good sounding and just plain tough, don't know what a good choice is now though. Tried a NAD and it gave me about 18 months.