Hot, humid weather has had New Hampshire residents running air conditioners and fans nonstop just days after electric utilities dramatically increased their rates.The supply rate for Eversource in New Hampshire was 10 cents per kilowatt hour before more than doubling to 22 cents as of Aug. 1. That's the highest rate in the region, according to Don Kreis, New Hampshire's consumer advocate.Kreis said Granite Staters might be shocked by their September bills, which will reflect the increased rate. He said now is the time to shop around for electricity providers, but residents should be careful to read the fine print."If ever there was a time to be vigilant about what's on your electric bill and where you're getting your electricity from, this is the time to do it," Kreis said. "It really is a good idea to look at what other competitive suppliers in your territory are offering and then seeing if you can get a better rate and thinking about whether you're willing to commit to that rate for a fairly extended period of time."He said there are two important things to know for anyone looking to get electricity from a competitive supplier. One is that people are often locked into long-term contracts, so if the market goes down, rates could be worse. The other is to pay close attention to the end date of the contract, so you're not automatically rolled over into a higher rate.