Renting an air conditioner (AC) may initially appear to be a cost-effective solution for summer heat, especially for those in temporary housing. However, a common oversight can turn this seemingly budget-friendly choice into a costly mistake. Many renters focus solely on the monthly rent and security deposit, neglecting the age and efficiency of the AC unit. Renting an outdated, non-inverter AC can lead to exorbitant electricity bills, potentially reaching ₹56,000 over two summers. In contrast, purchasing a new 3-star inverter AC costs about ₹35,000 upfront, plus installation fees, and results in lower electricity costs totaling around ₹24,000 over the same period. Ultimately, while renting an AC can cost ₹74,000 with no asset to show for it, buying one totals approximately ₹60,500, leaving the owner with a unit worth ₹15,000 at resale. Additionally, renters should be cautious of unclear maintenance clauses and ensure they understand the responsibilities outlined in rental agreements.