I think your agent has either taken too hard a line or misunderstood the circumstances of the house status.
- It's not empty -- you've already said you've left some appliances in it --
- It's not unattended -- you have a real estate agent that is looking after it in preparation for sale and you're still maintaining it -- keeping the heat on and the utilities working, clearing the sidewalks, mowing the lawn, caring for the garden, etc.
- You haven't abandoned it -- you'll have to be in the house for final clean-up, closing, etc. In fact, although you'll be travelling, you won't completely move out of the house until you close the sale.
In other words, you haven't left the house unoccupied, it's just that at some time in the future it will no longer be your primary residence -- it will remain your primary residence until you actually close on a new house in WA. Hopefully you will be able to sell this house quickly and move on.
In my case, I bought my new house before putting my old one up for sale. I insured the new house with USAA, and stated that the new house was going to be my primary residence. It took three months to sell the old house, and during that time USAA provided insurance for both locations.
There are variations -- for example, many people have a vacation home or a secondary home that may be unoccupied for months at a time.
If you're eligible you might check with USAA on how to handle this question. Since they primarily cover military officers they are regularly faced with questions of houses that will be vacant for extended periods of time. You might also call your state insurance commissioner's office in Columbus and ask them for advice. Regards --