Center Vent gauges

[D's GS-T]

I got a couple of quick questions. when installing center vent gauges how much does it effect your heat and A/C. the A/C doesnt matter so much, but it gets very cold up hear in the winter so how well would te car heat up. Also can running heat with the gauges mounted like this cause any damage?

 

[Ajax]

I have mine that way and I live in Iowa dont drive my car much in the winter but I blocked mine of with ducktape it just forces the air out other places so it really really blows by your feet or out the door vents if you have it turned to the top part. but you will have to use your door vents more and if you turn up the fan to hi you can hear the "forced" air a little more not that it bothers me but it is a little louder than stock.