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Convectors converted to part time airconditioning vents
So at the end of December I had a zoning valve break on my home that had a separate zone for an attached office. Zoning valves being expensive I opened up both valves and contolled the system from the main house. The office was too cold with this setup and I called in a pro who upgraded venting on all 3 mains and fixed up some piping. The office is still too cold so I have been doing everything I can to squeeze as much heat as possible out of the system. Today when I took the covers off the convectors to vacuum them out I discovered that some of them had holes cut in the bottom so they can act as air conditioner vents. (See picture) will this effect the performance of the convectors? Should I plug up the holes it the winter or would it not make a difference? Thanks