The good news is that heating systems in modern homes are safer than they’ve ever been before. But while many people never experience any major risk to their safety due to a furnace or boiler, it’s still a possibility. Any heating system that uses combustion to work, like a natural gas furnace, could potentially leak a dangerous gas called carbon monoxide (CO, for short) into the home.

The heat exchanger is where combustion produces a flame as natural gas ignites. This heat is contained within a heat exchanger made of aluminum or steel. It is essentially a curved tube, and the smoke and carbon monoxide byproducts vent through the other end and out of the house. Air blows over the heat exchanger to heat up and is sent to the ducts running throughout the home.

Unfortunately, over time, the heat exchanger can become damaged. This is especially true if you have anyone but a professional technician work on your furnace, but it can also happen with time. You should have HVAC technicians inspect your heating system each and every year to check for leaks and cracks.

Carbon monoxide is an odorless, colorless gas. That means you wouldn’t have many ways to notice if it were in your home. It is poisonous, and sometimes people don’t know about it until people in the house start to get sick.

Carbon monoxide detectors save lives. A CO detector near each room where people sleep (and throughout your living spaces) should be tested each month and replaced every 5-10 years. You should also replace the batteries for your CO and smoke alarms every 6 months (even if the test works).

Let’s face it—halogen and incandescent headlight bulbs are a thing of the past. fanless, driverless LED headlight bulbs were used in this installation.

If your vehicle allows for horizontal adjustments, mark the distance between your headlight centers with two vertical lines of tape. These lines are important for projector headlights and/or lining up beam cutoff points. Repeat these tape lines for your other headlight.

6. Remove your headlight assembly if necessary, remove the current bulbs, and install your new LED bulbs. Check your owner’s manual for specific instructions on how to replace your headlight bulbs.

7. Depending on your vehicle, you may have to adjust your headlight beam before or after the assembly has been reinstalled. Your owner’s manual will explain how to adjust the beams. Align each headlight so that the top edge of the beam is at the same height as your horizontal line(s). If your headlights can be adjusted horizontally or produce two light cutoff points, use the vertical tape lines to align them properly.

3. Shake the vehicle to ensure that your suspension system is settled. For more precise adjustments, inflate all tires to their designated psi capacity and have someone sit in the driver’s seat. Also, make sure that your vehicle’s gas tank is at least half full.

4. Measure from the ground to the center of your headlight assembly where the bulb is located. This step must be done for all vehicles. If your vehicle allows for horizontal headlight adjustments in addition to vertical adjustments, it’s important that you also measure the distance between the centers of both headlight bulbs. The vehicle featured in this video allows for vertical headlight adjustments only; therefore, center lines aren’t necessary but are shown for demonstration purposes.

5. Turn on your low-beam headlights. Using painter’s tape, mark your headlight measurements on a flat wall. Measure from the ground up, and apply a horizontal line of tape to the wall; this line represents the top of your headlight beam. You can either apply one long, continuous line or small sections where the brightest areas of the headlight beams are shown.

If your vehicle allows for horizontal adjustments, mark the distance between your headlight centers with two vertical lines of tape. These lines are important for projector headlights and/or lining up beam cutoff points.