Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to keep your ac running strong [title] Have your unit serviced regularly. [substeps] One of the best things you can do to ensure that your air conditioner remains functional is to have the unit serviced on a regular basis. Regular service is important, because it will keep the unit performing optimally.

Ending1: Additionally, it is guaranteed that you will be able to get your unit working as well as it can. Conserving money has been shown to help reduce the amount of monthly costs which contribute to the ongoing cost of your air conditioner unit. Ending2: Also, service and repair should always be performed by a licensed technician. Performing maintenance on your own could lead to more severe problems, and could void any existing warranties on the unit. Ending3: [title] Reduce the risk of any fluid leaking under the joint. [substeps] Is something that could potentially encourage fluid leaking from your ac unit or risk damage that you may later recover from. Ending4: Regular service means that your unit will be serviced more frequently, and will be paid less for runs that cost more fuel. [title] Don't run into the wind if it gets chilly.

Answer format: ending1/ending2/ending3/ending4