When temperatures drop, the furnace in your home quickly becomes one of the most important appliances. A faulty furnace can cause an uncomfortable climate in your home or, even worse, put everyone inside your house in danger.

It won’t be long before winter gets here. With it will come the cold weather and the need to run your furnace more often. While this is a great way to keep you home warm and comfortable, it can also have an impact on your heating bill.

Over time, your heating system will start to lose its efficiency and the cost of repairs will start to pile up. If you feel like your HVAC unit needs constant repairs, it might be best if you invest in a new one.

To escape this summer’s heat and humidity, you’ve probably already turned on your air conditioning. While the AC may feel like sweet relief, the air inside your home may be more polluted than the stifling heat outside.

The mold you find may be green, brown, or black. Mold plays no beneficial role indoors and can destroy surfaces and cause a musty smell throughout the home. Mold can also cause severe health problems to those sensitive to it.

When to Repair or Replace the Air Conditioner No one wants the summer heat to get in the way of enjoying all the activities that only summer can bring. If you have air-conditioning that you think is not working, this is the time to either replace or repair. Here is a guide to help you decide whether you should repair or replace your central air unit. A/C Unit’s Age The age of your air conditioner is a major criterion for whether to replace or repair. Air conditioners that are more than 10 years old should have a replacement. This is because older models tend to be less energy-efficient. Manufacturers nowadays tend to increase the competitiveness of their products. They do this by making HVAC systems that are more energy-efficient. Today people are environmental-conscious and embrace products that help them save energy costs. Plus, if your HVAC system is from 2006 or earlier, it might not meet federal requirements. Cost of Repairs Some HVAC professionals recommend that you use the 5,000 rule. You multiply the age of your air conditioning with the cost of repair. If the amount exceeds $5,000, it is a sign that the system needs a replacement not a repair. But, if the total is less than $5,000, you can go ahead and have that air conditioner replaced. Others recommend that you use the 50% rule to decide if you need to repair or replace your air conditioner. With this rule, you add up all the costs incurred in repairing the system. If they are 50% or more of the air conditioner's value, you should have it replaced. If the total is less than 50%, repairing the air conditioning will work.