If the rooms you rent out are always kept available for rent, even when vacant, then you can consider them in use for rental purposes all year.
Where TurboTax asks, "Do any of These Situations apply to This Property"
Select "I rent out part of my home".
If you mark the box "yes" for TurboTax to allocate per the percentage of the business portion of a mixed-use property, the expenses are only entered one time in the rental section and TurboTax will allocate correctly to personal Schedule A and rental to Schedule E according to the percent you entered.
Only include the rooms exclusively used for rental in the rental area percentage.
If an expense is for both rental use and personal use, such as mortgage interest or heat for the entire house, you must divide the expense between rental use and personal use. You can use any reasonable method for dividing the expense. It may be reasonable to divide the cost of some items (for example, water) based on the number of people using them. The two most common methods for dividing an expense are (1) the number of rooms in your home, and (2) the square footage of your home.
See the section and example under Renting Part of Property in this IRS article.
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