I read this study that artificially heating 5 sites for 23 years has no effect on its local environment when compared to naturally warmed sites.
The results are exactly the same.
The same result happened when I was involved in an Acid Rain study in MN 35 years ago. We planted acid sensitive plants downwind of a coal burning plant. There was no change in the plants vs not downwind of the coal burning plant.
The study was never made public (for some reason)
The only answer is government issued freezers to only be used outside with their doors open.