While new energy - efficient lighting products typically cost more up front, they consume much less energy during their lifetime, saving you money in the long run.
इतना ही नहीं, कुछ लोगों ने तो ऐसी खिड़कियाँ लगवायी हैं, जिनसे हवा बिलकुल बाहर न जा सके ।