Clean your permanent air filters or replace disposable ones every single month. If you have the choice, an electrostatic is the best option on the market today. Be sure to turn off your unit before you change the filter as it should never be run without a filter in place.
If you want to heat your home with an alternative to traditional units, consider a pellet furnace or stove. These pellets are made from off-cuts of wood and waste paper. These burn very cleanly and offer a lot of heat without using fossil fuels. It's a green way to stay comfortable.
Make sure the equipment you are buying is ENERGY STAR compliant. It may seem a small thing, but it isn't. Products that are ENERGY STAR compliant can save you a lot of money in energy costs over the year. It can be over $100 easily, sometimes a lot more.
If you end up having to buy a new HVAC system all together and need a licenced electrician to help with the install give us a call 505-226-7500.