The safest to have central air

We used to live in a house that didn't have central air. We had a heater that produced a bad smelling air, like a gas leak, it was awful especially when I was pregnant at the time. I had to hold my breath at times. A good thing it didn't cause me to have any complication, and no harm done to our baby. People have actually died from smelling carbon monoxide. As for our current central air, we have it for many years now, and I imagine it needs to be replaced, as it also broke down a year ago during the cold season, but a good thing we called a repair man and had it fixed in no time. However, we would love to have a new one that we can rely upon to work at times when we need it most like during the winter and summer. Speaking of having a central air, I learned that there are some safe to use central air at the site provided by Lowry Electric, Heating & Cooling based in PA. We can get the kind of central air that doesn't deplete the ozone because the air is safe for the environment; it helps prevent the global warming. So, I am sure people will find heating and cooling PA reliable and safe for their family. The central air such company offers work automatically with shuting off when it detects harmful conditions like when the air flowing is not conforming to the clean level. That is what I like, and we will need to look in to getting a new central air in the near future just to be safe. We want our family to breathe clean air inside and outside our house.