Do you change tank temperature along the year?

[KonradTO]

Hi all,
Do you change the set temperature along the year or you try to keep it constant?
I was thinking about shifting very slowly the tank temperatures from winter to summer. I would like to increase temperatures slowly from 75 in winter to 80 in summer. This to save some energy in winter (and make heaters last longer) and avoid heat wave problems in summer, where I get temperatures of about 70-82 F. Is this something that someone does or there could be some dangers with this? (other than maybe reducing coral growth)

 

[blaxsun]

No, I try to keep it constant around 78.

 

[Jeffcb]

Mine fluctuates 78-80. Heater is set at 78.