I am a bit concerned with leaving 3 heat emitters on while I'm not at home. Everyone has their own Machiano (sp?) wire cage, so I know that heat emitters will be ok for them. Are there any equivalent alternatives though? I know the thermostats would shut them off when the lamps get warm enough, but again, I just worry about something happening and something catching on fire. Or are they perfectly safe and I'm just living in the past with light bulbs burning things down?