What people keep running into with heating and cooling
Complaints tagged heating and cooling, each raised by more than one person. One-off posts are not included.
49 recurring problems · 510 people · 16 forums we read
Raised more than once
Most people first.
- 114Should I pay for appliance repair or fix it myself?Paying for professional service calls and OEM parts often costs hundreds of dollars more than buying third-party components online and fixing the appliance yourself. However, guessing wrong about whether a machine is actually safe to use can leave you with a dangerous hazard instead of a working fix.
- 55How to choose between different HVAC replacement quotesHomeowners replacing aging systems face conflicting quotes and unfamiliar equipment brands like Lennox and Bosch. Without knowing how to compare these options or contractor experience, people risk choosing unreliable installers or overpaying for equipment that doesn't fit their needs.
- 30Why do small bathroom remodels cost so much?Contractor quotes for basic renovations routinely range from $15,000 to over $30,000 even for small spaces like a 5x7 bathroom. This huge gap between expected and actual costs makes standard updates feel prohibitively expensive, leaving homeowners unable to afford necessary repairs without blowing their budgets.
- 30Why are HVAC replacement quotes so expensive?HVAC technicians often quote thousands of dollars for new furnaces and air conditioning units—sometimes reaching up to 19k—leaving homeowners scrambling to afford it or considering risky DIY fixes. Lacking cash and unsure what pricing is actually reasonable, people feel vulnerable to overpaying when their heating or cooling systems fail.
- 28What to do when an HVAC installation fails inspectionBad HVAC installations often involve dangerous issues like gas leaks, missing thread compound, uninsulated ducts, and mismatched or outdated equipment. These critical safety code violations and missing warranties leave homeowners dealing with failed inspections, hazardous living conditions, and unresolved cleanup costs.
- 25Why is one bedroom getting way more air than other rooms?Air conditioning systems often push uneven amounts of air through vents, flooding a single bedroom with cold air while the rest of the house or upstairs stays warm. This makes it impossible to achieve balanced cooling, leaving the main thermostat reading 78 degrees while a single room drops to 70.
- 17Why does my brand new AC not cool as well as the old one?New cooling systems often feel less effective because installers may misconfigure airflow settings or fail to balance multi-room temperatures properly. This leaves homeowners dealing with rooms that stay significantly warmer than they were with older equipment, causing regret and doubt over the replacement choice.
- 16How to know if my HVAC air filter is the right size?An air filter that sticks out from the slot or doesn't sit flush indicates the wrong dimensions, which allows unfiltered dust to bypass the filter and enter the system. Measuring the actual filter slot and comparing it against standard sizing ensures a proper fit that protects the equipment from debris buildup.
- 14Why is my ductwork dripping condensation inside the walls?Ductwork running from unconditioned spaces into wall cavities collects condensation on its exterior, causing water to drip into walls. This moisture leads to severe fungal growth and structural damage that often requires tearing out the walls.
- 13Car heater blowing cold air even with good coolant and thermostatCar heaters can blow lukewarm or cool air despite having normal coolant levels and a working thermostat. This leaves drivers with weak or no heat coming from the vents when turning the system on full tilt.
- 12How do I use and maintain an oil heating system?Switching from a familiar electric heat pump to heating oil leaves new homeowners in the dark about how to order fuel, manage tank levels, and set efficient thermostat schedules. Without clear guidance on these basics, adjusting to an unfamiliar heating system becomes an overwhelming guessing game.
- 11Gap around furnace b-vent after roofingRoofers often leave an open gap between the double-wall B-vent and the surrounding roof jack, which lets light and potentially water through. Standard caulk should not be used here because furnace vents get too hot; instead, you need a high-temperature rated storm collar and silicone flashing designed for gas vents to properly seal the opening without creating a fire hazard.
- 8Why does my furnace make a loud banging noise?Delayed ignition causes a small explosion of built-up gas inside the combustion chamber, resulting in a loud bang when the furnace finally fires up. This issue stops the heating system from operating smoothly and requires immediate attention to prevent damage to the equipment during freezing weather.
- 8How do I reconnect a disconnected HVAC duct?HVAC and appliance exhaust ducts can come loose due to renovations, vibrations, or wear, leading to air leaking into living spaces instead of venting outside. Reconnecting them requires securing the pipe alignment and sealing the joints properly to ensure the system functions efficiently and safely.
- 8Which way should my HVAC filter arrow face?The airflow arrow on a home HVAC filter must always point toward the blower motor or in the direction the air is actually moving through the ductwork. Confusion over whether air moves upward, downward, or sideways leads people to install filters backward, which can restrict airflow and strain the system.
- 7Burning smell coming from HVAC ventsA burning smell paired with a running basement blower typically signals an electrical failure, such as a dead hard start kit or overheating motor components. Because the system continues to draw power while airflow stops completely, ignoring the odor can quickly lead to permanent equipment damage or a fire hazard.
- 7Ceiling fan has power at switch but won't turn onEven though power and connections have been verified, the fan fails to run at all. This prevents the unit from moving air and functioning properly.
- 7Can I replace a hot water heater with a direct swap if ports match?Finding a new water heater with matching port and plug locations does not guarantee a simple, direct swap because tight spaces often complicate removal and installation. Obstacles like cramped clearances can require cutting tools to get old parts out, turning what seems like an easy swap into a more involved project.
- 6Why is my attic apartment so hot in summer and cold in winter?Attic apartments trap extreme heat from the roof while sharing a single HVAC sensor located elsewhere in the house, leaving the top floor sweltering at 80 degrees or freezing at 64. Because the central system cannot properly regulate the space, tenants are left struggling with unmanageable indoor temperatures and direct drafts from blowing vents.
- 6Can I keep and resell my old working HVAC system?Contractors typically expect to take and handle old units, leaving homeowners wondering if they can keep a functioning system to sell and recoup some of their replacement costs. Because used HVAC units have decent potential value, keeping them avoids unnecessary waste, though it requires having the storage space and navigating whether to ask the installer to leave it behind.
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Topics that keep appearing on the same problems — not topics with similar names.