I know this isn’t really a frugal thing but it is a little known trick that is really helpful in hot weather. You can roll down the windows in your car using your key remote.
All you need to do is press the remote’s unlock button, releasing it, then pressing it again and holding it down. Also, depending on the car model instead of using the remote, you can insert your key in the door lock and turn it clockwise, release it, then turn it clockwise again and hold. Btw, Turning the key counterclockwise will usually raise the windows back up.
It works in the following models:
Acura (mdx/tl/tsx)
alfa romeo (159)
Audi (A3/A4/A6/A7)
BMW (3 Series/5 Series/7 Series/M5/Z4)
Chevrolet (Corvette)
Chrysler (Sebring/Town & Country)
Dodge (Challenger/Charger/Durango/Journey/Ram)
Ford (C-Max/F-150/Focus/Fusion/Mondeo/S-Max/Taurus)
Honda (Accord/Accord Crosstour/Odyssey/Pilot/Ridgeline)
Infiniti (G25x/G35/G37/I30/I35/M35)
Jaguar (S Type/XJ8/XK8)
Lexus (ES300/GS350/RX300/RX350/RX400h)
Lincoln (ls/mkx/mkz/zephyr)
mazda (6/CX-9/MX-5 Miata)
Mercedes-Benz (B180/C240/C300/CLK350/CLS550/E350/E500/ML550)
Mini Cooper (Clubman)
Nissan (350Z/Altima/Maxima/Murano/Titan)
Volkswagen (Beetle/Golf/Jetta/Passat)
Volvo (C30/V50