During the icy spell before christmas, my car heater/air conditioning failed. Being a renault I knew it would be expensive to fix so decided to find a cheaper option. This heater does not do the job if you have a big windscreen - ie laguna sized!! It also didnt fit well onto the dashboard as my car does not have a flat space to fix it to. Even after 20 minutes it had not cleared enough of my screen to be safe to drive. I know the weather was particularly cold, but I would not recommend this - I ended up taking the car to the garage after all!