Get a load of Macron’s response to the yellow vests...
http://www.lunion.fr/125101/article/2018-11-27/direct-transition-ecologique-suivez-en-direct-les-annonces-d-emmanuel-macron
https://www.bfmtv.com/economie/transition-ecologique-un-credit-d-impot-pour-changer-de-fenetres-1575336.html
Taxes might go down if the price goes up.
Note the use of the conditional.