Sheets , tarps, lights, Sprinkler systems work to if you want to go to that much trouble. Once I grew pumpkins in February. My mother when seeing those pumpkin vines shot her eyebrow up and said something isn’t right here. I said well I planted them in February turned the hose on every morning at 3am for a month before the sun came up. It was a warm year. Lets just say we had canned pumpkin for the next six years literally. Sometimes we can do things but should we? I have learned the early blooming pears like improved kieffer are very resistant to freezes. My plan is to grow later blooming pears and save the sweating. I jokingly call the improved kieffer potato pears because they are the potato of my orchard. You will always have food in your belly with them around. They are not the best pear but there is worse. In the future they will likely have 8 foot tall containers for fruit trees like the milk jugs used to cover tomato plants. A spray of copper gives you several extra degrees of cold tolerance as well. Strange when i was younger I loved the improved kieffer. There are still days when i do and I eat several when I’m in the mood for them. Tastes change as we age and I prefer many pears to those now. Pear blooms as shown in this thread from 2016 can take some serious cold weather. The pictures from 2016 say it all Strange weather - Will it get our blooms and fruit?
That weather didn’t bother my pears as shown here Here comes the 2016 apple and Pear harvest!