The National Weather Service in Huntsville is forecasting dangerous heat for our area beginning Wednesday.

That means your air conditioner will be working even harder, and if it's not running at its most efficient, it could be costing you more money.

Here are some simple signs that could indicate it's time for your AC to be checked out.

--It's blowing warm air
--Large differences in temperature room to room
--Weak airflow from vents
--A musty odor
--More dust than usual in your home.

And remember: if it's been more than a month since you changed your filter, see if it needs a new one.