The cost to install a window air conditioner averages between $150 and $300, depending on the size you need. Installing a window air conditioning unit can bring added comfort for a reasonable price, but it will be less powerful than a central air conditioning system.any central air conditioning systems use the furnace blower to distribute cool air through the home. If you do not have a central heating system installed, it is cost-effective to install a heating and air conditioning (HVAC) system at the same time.
1 The average cost for a transmission fluid flush is $150 to $250 for most cars and up to $375 for lifetime fluids.2  The average cost for a transmission fluid filter and fluid service is $89 to $159 for most cars and light trucks. Midas Hawaii in Honolulu, Hawaii, offers transmission flush services for $144.99, which includes a test drive in addition to transmission fluid change.
1 For example, CostHelper readers report paying $90-$378 for a transmission flush at a oil-and-lube or auto repair shop, at an average cost of $160; or $77-$295 at dealerships, at an average cost of $205; and a CostHelper reader in Nevada reported being charged $766 for a transmission fluid change on a Lamborghini Diablo. AutoMD.com provides general how-to instructions and estimates the project as moderately difficult. 2  The main cost is the quarts of new transmission oil. 3  CostHelper readers report paying $40-$175 for do-it-yourself supplies, with an average of $90.