Co monitor went off; called Allen; they were ready to dispatch a service person at the time of my call. Fortunately, it was just a low battery on the monitor, and we scheduled a full service inspection of the heating and a/c systems for 3 days later. Jim F. arrived on time; performed the inspection; reviewed the results, and even enjoyed petting my dog--a real plus in our house! The furnace was fine--no excessive Co or gas.
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