Dear Glenn: I have a three-bedroom ranch, and I am going to replace my furnace and air conditioner because they are very old. I need some help with choosing a good furnace/air conditioner brand. I also have birds, cats and a dog, so I will need a good air cleaner. I also will need a good humidifier for the birds.

I have no idea what is considered a good furnace/air conditioner. I was told to replace both at the same time because I would only have to pay once for the labor. Can you suggest some brand names that would be good? Thanks for your time.

Cindy, via e-mail

Dear Cindy: Start by asking friends and neighbors about their experience with the furnace/AC units that they have.

If both the heating and air conditioning units are the same age, then you can really save. Plus look into HEPA (High Efficiency Particulate Air) bypass air cleaning systems for filtered air 24/7.

Warranties -- on furnaces and air conditioners for 10 years on parts and labor -- should be addressed. They should be backed by the manufacturer of the furnace/AC units. Look for NATE (North American Technician Excellence)-certified installers to install your products.

If you act soon, and purchase the proper products, you may be eligible for tax credits and rebates from the federal government and from your state and local utility.