Cov hlau nplaum mos: Cov ntsiab lus carbon tsawg heev, tom qab siv mus ntev, tuaj yeem ua kom muaj qhov sib nqus zoo thiab ruaj khov.
Siv nyob rau hauv me me adjustable relays, xov tooj exchanges, mov cooker thermostats (magnets) thiab sib nqus cov ntxaij vab tshaus.
