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4 Heating System Noises You Shouldn’t Ignore

January 7, 2025
It takes a few minutes for the fan of a furnace to finally start that familiar whir sound. That’s because it takes a few minutes for the furnace plenum to actually heat up after the burners light, and the fan does not start running until it is warm enough to deliver air to the vents in your home. Once you do hear that spinning, whirring blade and the rush of air through the vents, it’s a satisfying sound—unless it’s accompanied by an unfamiliar noise.
Other than the sounds you are familiar with as your furnace starts up, you should not expect to hear much else as the system runs. If you notice noises from the vents or the unit itself, it’s usually time to call in technicians. Here are 4 of them you cannot afford to ignore.
1. Loud Bang at Startup
We’re going to start with the noise that likely scares you the most, when you hear a loud banging noise coming from the furnace. If this happens consistently, rather than when the furnace first starts up, it could have to do with the air ducts or the sheet metal siding of the furnace expanding and contracting, the result of poor duct installation or improper furnace sizing.
If this happens only at furnace startup, though, you have reason for concern. This may be due to something as simple as a dirty furnace burner. However, that dirt allows gas to buildup, causing a sort of mini explosion when the burners finally do ignite! While it may not affect your home right now, this rattles the heat exchanger, which could eventually crack and leak poisonous carbon monoxide into a home.
2. Squealing
That squealing you hear from the furnace may be the result of a lack of lubrication or a blower fan belt that is wearing out. This means it’s an easy fix for most technicians, so why is it such a big deal? Because, if you let it go on for too long, the fan may stop working, stopping the furnace from running when you need it most! It’s better to repair the problem now than to wait for a system breakdown.
3. Low Rumble
If you hear a low rumbling noise, it’s probably loudest when you are right near the unit. It’s hard to say what the cause is without seeing and hearing the furnace ourselves. One common explanation, though, is that the pilot flame is too low. Check the flame to be sure it is blue rather than yellow or orange. Otherwise, a rumbling noise could be attributed to a dangerous carbon monoxide leak, depending on the unit, so shut off the system and call for help if you believe this may be the case.
4. Scraping
Finally, we don’t think a scraping sound—like metal on metal—should ever be ignored within a furnace. Most likely, the motor mount has come loose from its casing. In other words, it’s just what it sounds like: metal scraping on metal. This might not seem like such a big deal right now. However, the damage that can result to the blower fan may be severe enough to require replacement, whereas it may only need quick repairs if scheduled right now!
4 Heating System Noises You Shouldn’t Ignore
By 7011748352 February 20, 2025
When winter hits Hailey, Idaho, your furnace works overtime to keep your home warm and comfortable. But did you know that one of the easiest ways to maintain your heating system’s efficiency is by regularly changing the furnace filter? Many homeowners overlook this simple task, leading to increased energy costs, poor indoor air quality, and potential damage to their HVAC system. So, how often should you change your furnace filter? Let’s break it down. Why Changing Your Furnace Filter Matters Your furnace filter traps dust, pet dander, pollen, and other airborne particles, preventing them from circulating through your home. A clean filter ensures proper airflow, reduces strain on your furnace, and improves indoor air quality. Neglecting this maintenance step can cause your system to work harder, leading to higher energy bills and potential breakdowns. How Often Should You Change It? The answer depends on several factors, including filter type, household conditions, and how often you use your furnace. Here’s a general guideline: Basic fiberglass filters: Every 30 days Pleated filters: Every 60–90 days High-efficiency HEPA filters: Every 6–12 months Homes with pets: Every 30–60 days Allergy sufferers: Every 30 days Heavy furnace usage (winter months): Every 30–45 days If your home has multiple occupants, pets, or someone with allergies, it’s best to check the filter monthly and replace it as needed. Signs Your Furnace Filter Needs Replacing Even if you follow a set schedule, your furnace may give you signals that the filter needs to be changed sooner. Look for these signs: Increased Dust in Your Home – If you notice more dust accumulating, your filter may be too clogged to trap particles efficiently. Reduced Airflow – A clogged filter restricts airflow, making your system less effective at heating your home. Higher Energy Bills – If your heating costs are rising without a temperature change, a dirty filter may be making your furnace work harder. Strange Furnace Noises – A struggling system may produce unusual sounds, signaling it’s time for maintenance. Visible Dirt and Debris on the Filter – If your filter looks clogged, it's time to replace it. The Bottom Line Regularly replacing your furnace filter is a simple yet crucial step in maintaining your heating system’s efficiency and prolonging its lifespan. Not only will this improve your indoor air quality, but it will also keep your energy bills in check and prevent costly repairs. Need HVAC Maintenance? Call the Experts! If you’re unsure about your furnace’s condition or need professional maintenance, Evans Plumbing, Heating, and Mechanical is here to help.
By 7011748352 February 20, 2025
As temperatures drop in Hailey, Idaho, your furnace is working hard to keep your home warm. But what happens when you start hearing strange noises coming from your heating system? Unusual furnace sounds can be an early warning sign of trouble, and ignoring them could lead to costly repairs down the road. Here are some common furnace noises and what they might mean. 1. Banging or Booming If you hear a loud banging or booming sound when your furnace kicks on, it could indicate a delayed ignition problem. This occurs when gas builds up before igniting, causing a small explosion. If left unchecked, this issue can damage your furnace’s heat exchanger, leading to costly repairs or even system failure. Possible Causes: Dirty burners preventing proper ignition Low gas pressure Ignition system malfunction What to Do: Turn off your furnace and call a professional HVAC technician to inspect and clean the burners or adjust the gas pressure. 2. Squealing or Screeching High-pitched squealing or screeching noises are often linked to issues with the blower motor or fan belt. Over time, belts can become loose or worn, and motor bearings may need lubrication. Possible Causes: Worn-out or loose blower belt Motor bearings in need of lubrication Malfunctioning blower motor What to Do: Schedule a furnace inspection to replace belts, lubricate motor bearings, and ensure everything is running smoothly. 3. Rattling or Vibrating A rattling or vibrating furnace could be a sign of loose components or ductwork. If you hear metal-on-metal sounds, it may indicate a more serious mechanical issue. Possible Causes: Loose screws or panels Unsecured ductwork Failing blower motor What to Do: Check for loose screws and panels and tighten them if necessary. If the rattling persists, have an HVAC technician inspect your system. 4. Clicking Sounds While it’s normal to hear some clicking when your furnace turns on and off, excessive clicking could be a sign of a failing ignition system or a faulty relay. Possible Causes: Faulty ignition system Defective flame sensor Electrical component issues What to Do: If the clicking is persistent or your furnace struggles to ignite, call a professional for a thorough inspection. 5. Whistling or Hissing A whistling or hissing noise often indicates an airflow restriction or a gas leak. If you suspect a gas leak, turn off your furnace immediately and evacuate your home. Possible Causes: Dirty or clogged air filter Leaky ductwork Gas leak (if accompanied by a sulfur smell) What to Do: Replace your air filter and check for any visible duct leaks. If you smell gas, leave your home and call your gas provider or HVAC professional immediately. When to Call a Professional If your furnace is making strange noises that persist after simple troubleshooting, don’t ignore the warning signs. At Evans Plumbing, Heating, and Mechanical, we provide expert furnace repairs and maintenance to keep your system running safely and efficiently.
By 7011748352 February 20, 2025
When the temperatures drop in Hailey, Idaho, the last thing you want is for your furnace to start blowing cold air. A malfunctioning furnace can quickly turn your cozy home into an icebox, making it crucial to identify and address the issue as soon as possible. Here are some common reasons why your furnace might be blowing cold air and what you can do about it. 1. Your Thermostat Settings Need Adjustment Before assuming the worst, check your thermostat settings. Ensure it is set to "Heat" and not "Fan" or "Cool." If the fan is set to "On," it will blow air continuously, even when the furnace isn't actively heating. Switching the fan to "Auto" allows it to only run when heat is being produced. 2. Your Furnace Filter is Clogged A dirty or clogged furnace filter can restrict airflow and cause the system to overheat. When this happens, your furnace's safety mechanism may shut down the burners, allowing only cold air to circulate. Check your filter and replace it if it's dirty. 3. The Pilot Light is Out If you have an older gas furnace, a blown-out pilot light could be the reason for the lack of heat. Check to see if the pilot light is lit. If it's out, relighting it might solve the problem. However, if it continues to go out, there may be an issue with the thermocouple or gas supply that requires professional assistance. 4. Your Furnace is Overheating An overheating furnace may shut itself down as a safety precaution, leaving only the blower running, which results in cold air blowing through the vents. Common causes of overheating include a clogged filter, blocked vents, or mechanical failures. If replacing the filter doesn't help, it's time to call in an HVAC professional. 5. There’s a Problem with the Gas Supply If your furnace isn't getting enough gas, it won't be able to produce heat. Check other gas appliances in your home to see if they're working properly. If there's an issue with your gas supply, contact your utility company or a licensed HVAC technician. 6. Your Ductwork Has Leaks Leaks in your ductwork can allow warm air to escape before it reaches your living spaces, leaving you with cold air blowing from your vents. If you suspect ductwork issues, an HVAC professional can inspect and seal any leaks to restore efficiency. When to Call a Professional If you've checked your thermostat, changed your filter, and your furnace is still blowing cold air, it's time to call the experts. At Evans Plumbing, Heating, and Mechanical, we provide professional furnace repair services to keep your home warm and comfortable all winter long.
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