I suffer from C.O.P.D and asthma and Had really been having a bad time this winter. A lady from our church told me she had gotten a electronic air filter put on their furnace from Johnson Heating and Cooling and it had made a huge difference in her breathing. I called and got one ordered and it just took a short time to get it in and installed. it has been three weeks and my coughing has almost stopped. This has been a miracle. Anyone with breathing problems I highly suggest the electronic air filter. Thank You so much Jean Doty
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