Why is my furnace blowing cold air?

L&L Mechanical Services is based in Tyler, Texas, and serves communities throughout East Texas.

L&L Mechanical Services serves Tyler, Chandler, Henderson, Jacksonville, Kilgore, Lindale, Longview, Whitehouse, and surrounding East Texas communities.

Yes. L&L Mechanical Services's team is licensed and insured.

HVAC contractors in Texas are licensed by the Texas Department of Licensing and Regulation, and plumbers are licensed by the Texas State Board of Plumbing Examiners.

Call (903) 539-8995, email will@llmechsvc.com, or use the quote form on the website.

Yes. L&L provides residential, commercial, and industrial HVAC, plumbing, and mechanical services.

L&L brings HVAC, plumbing, welding, and mechanical expertise under one roof, focusing on root-cause diagnosis, quality work, and clear communication.

Yes. The Recent Projects page shows completed HVAC, plumbing, and mechanical work.

Customer reviews are available on the Reviews page of the website.

Request a free quote through the website form or call L&L Mechanical Services at (903) 539-8995.

An AC blowing warm air may have a tripped breaker, dirty filter, frozen evaporator coil, low refrigerant from a leak, a failed capacitor, or a compressor or outdoor fan problem. L&L Mechanical Services diagnoses the root cause instead of just replacing parts.

Common causes include restricted airflow from dirty filters or coils, refrigerant leaks, undersized or leaking ductwork, and a system that is too small for the home. Extreme East Texas heat also pushes older systems to their limits.

AC coils freeze when airflow is restricted by dirty filters, blocked returns, or a failing blower, or when refrigerant is low. Turn the system off to let it thaw and call for service to fix the underlying cause.

A capacitor gives the compressor and fan motors the electrical boost they need to start. Capacitors commonly fail in Texas heat, causing a humming unit that will not start.

Water leaks usually come from a clogged condensate drain line, a cracked drain pan, a frozen coil that melts, or a failed condensate pump. Clearing the drain line often fixes the problem.

In hot East Texas weather, an AC may run for long stretches, but it should cycle off periodically. A system that runs nonstop without reaching the thermostat setting may be undersized, low on refrigerant, or struggling with airflow.

Many energy guides suggest about 78 degrees when home in summer and higher when away. Each degree higher can reduce cooling costs.

Repairs make sense for newer systems with isolated problems. Replacement is often better when the system is 12 to 15 years old or more, needs a major part like a compressor, or uses an outdated refrigerant.

Signs include warm air, ice on the refrigerant lines, hissing or bubbling sounds, and higher energy bills. Refrigerant does not get used up, so low refrigerant means there is a leak that should be found and repaired.

Yes. L&L Mechanical Services offers emergency HVAC and plumbing repairs. Call (903) 539-8995 for help.

How long does an HVAC system last in Texas?

What causes clogged drains?

L&L Mechanical Services serves restaurants, car dealerships, gas stations, medical facilities, retail, manufacturing facilities, rail companies, and large commercial properties.

Yes. L&L Mechanical Services installs and services rooftop units, exhaust fans, and ventilation systems for commercial properties.

Commercial HVAC systems should typically be serviced at least quarterly or twice a year depending on usage, equipment, and the business type.

Plumbing problems in restaurants, medical offices, and retail spaces can force closures, disrupt customers, and create health and safety concerns. Fast diagnostics and repairs limit the impact.

Restaurants need reliable cooling for dining areas, kitchen exhaust and make-up air, and ventilation to manage heat, smoke, and grease.

Yes. L&L Mechanical Services provides HVAC, plumbing, welding, and mechanical services for industrial clients, including structural repairs, exhaust system work, and custom mechanical solutions.

Make-up air replaces air removed by exhaust fans, such as in commercial kitchens, keeping building pressure balanced and exhaust systems working properly.

Many commercial service calls can be scheduled to limit disruption. Contact L&L Mechanical Services to discuss scheduling.

A single contractor who understands how systems interact simplifies coordination, speeds up repairs, and provides one point of accountability.

Call L&L Mechanical Services at (903) 539-8995 or submit the quote form on the website.

Clogged drains are caused by grease, food scraps, hair, soap scum, wipes, and mineral buildup. Main line clogs are often caused by tree roots or damaged pipes.

Multiple slow drains, gurgling toilets, and water backing up into tubs or floor drains when other fixtures are used are common signs of a main sewer line clog.

Chemical drain cleaners can damage pipes and often do not fully clear clogs. Professional drain cleaning is safer and more effective for persistent clogs.

Many homes benefit from professional drain cleaning every year or two, and restaurants often need more frequent service because of grease.

Signs include repeated backups, sewage odors, soggy spots in the yard, lush patches of grass, and slow drains throughout the property.

Yes. Roots seek out moisture and can enter small cracks or joints in sewer lines, eventually causing blockages and breaks.

Avoid grease, oils, coffee grounds, eggshells, pasta, rice, and fibrous foods, which can build up and cause clogs.

Only toilet paper and human waste should be flushed. Wipes, even those labeled flushable, paper towels, and feminine products cause clogs.

Drain odors often come from food and grease buildup, a dry P-trap, or venting problems. Persistent sewer smells should be inspected.

Yes. L&L Mechanical Services provides drain cleaning, leak repair, and sewer line solutions.

Uneven temperatures are often caused by undersized or leaking ducts, poor duct layout, blocked vents, insufficient returns, or rooms with more sun and less insulation.

Duct sizing is designing ductwork with the correct dimensions so each room gets the right amount of airflow. Proper sizing is critical to comfort, efficiency, and system lifespan.

Signs of leaky ducts include high energy bills, dusty rooms, uneven temperatures, and ducts in the attic that are disconnected, crushed, or poorly sealed.

Duct leakage can waste a significant portion of heated or cooled air, especially when ducts run through hot East Texas attics. Sealing and repairing ducts improves efficiency.

Yes. L&L Mechanical Services provides full ductwork design and installation, along with duct sizing and airflow optimization.

Static pressure measures resistance to airflow in the duct system. High static pressure from restrictive ducts or filters makes the blower work harder and reduces efficiency.

Many homes should change filters every one to three months, and more often with pets, allergies, or construction dust.

Proper ventilation removes moisture, odors, and pollutants and brings in fresh air, which improves indoor air quality and protects the building.

Commercial exhaust fans remove heat, smoke, fumes, and moisture from kitchens, shops, and industrial spaces. L&L Mechanical Services installs exhaust fans and ventilation systems for commercial properties.

Yes. Ductwork can be repaired or replaced separately when it is damaged, leaking, or poorly designed, which often improves the performance of an existing system.

A furnace blowing cold air may have a thermostat set to fan only, a dirty filter causing overheating shutdowns, an ignition or flame sensor problem, or a gas supply issue.

A flame sensor confirms the burner is lit on a gas furnace. When it gets dirty, the furnace may light and then shut off. Cleaning or replacing it is a common repair.

Gas furnaces often last 15 to 20 years or more with regular maintenance.

A furnace creates heat by burning fuel or using electric heat strips, while a heat pump moves heat from outdoor air into the home. Heat pumps are efficient in mild East Texas winters, and many homes pair them with backup heat.

Yes. Homes with gas furnaces, water heaters, or other fuel-burning appliances should have working carbon monoxide detectors near sleeping areas and on every level.

A cracked heat exchanger can allow combustion gases, including carbon monoxide, to mix with household air. It is a serious safety concern that usually means the furnace should be replaced.

A brief dusty burning smell is normal when heat is first used in the season as dust burns off. A persistent burning, electrical, or gas smell should be checked right away.

Yes. L&L Mechanical Services provides furnace installation and heating system repair for homes and businesses in Tyler and East Texas.

A furnace should be serviced once a year, ideally in the fall before heavy use.

Leave the home immediately, avoid using switches or anything that can spark, and call 911 and your gas utility from a safe place. Do not return until the utility says it is safe.

Central air conditioners and heat pumps in Texas often last about 12 to 15 years, while furnaces can last longer. Heavy summer use, maintenance, and installation quality all affect lifespan.

AC size should be based on a load calculation that considers square footage, insulation, windows, sun exposure, and ductwork, not just a rule of thumb. Oversized and undersized systems both cause comfort and efficiency problems.

SEER2 is the current efficiency rating for air conditioners and heat pumps, measuring cooling output compared to energy use. Higher SEER2 numbers mean greater efficiency. In the southern U.S., most new split systems must meet a minimum of about 14.3 SEER2.

Under EPA rules, new residential AC and heat pump systems have transitioned away from R-410A to lower global warming potential refrigerants such as R-454B and R-32. Existing R-410A systems can still be serviced.

Replacing both units together ensures the components are matched for efficiency, performance, and warranty, especially with the refrigerant changes in new systems.

Most residential system replacements take one to two days, depending on the equipment, ductwork changes, and electrical or refrigerant line work.

A package unit combines heating and cooling components in a single outdoor cabinet, often installed beside a home or on a roof. They are common where indoor space for equipment is limited.

A rooftop unit, or RTU, is a package HVAC system installed on a commercial building roof. L&L Mechanical Services installs and services rooftop units for commercial properties.

Not always, but leaking, undersized, or damaged ductwork can undermine a new system's performance. L&L Mechanical Services specializes in duct sizing and airflow optimization.

Yes. L&L Mechanical Services provides AC installation, heating installation, and complete HVAC system replacement for residential and commercial properties.

How often should HVAC be serviced?

HVAC systems should be serviced twice a year, once before summer for cooling and once before winter for heating.

An HVAC tune-up typically includes inspecting and cleaning key components, checking electrical connections and capacitors, testing refrigerant performance, clearing condensate drains, checking airflow, and performing safety checks.

Yes. Regular tune-ups can improve efficiency, catch small problems before breakdowns, and help extend the life of the system, especially with heavy East Texas summer use.

Spring is the best time for an AC tune-up, before the first heat wave and the busiest service season.

You can keep debris, leaves, and grass clippings away from the outdoor unit and gently rinse the coil with a hose with the power off. Deeper cleaning and electrical checks should be left to a technician.

Clean coils, proper refrigerant performance, and good airflow let the system cool and heat with less energy, which lowers utility costs.

Some manufacturer warranties require proof of regular maintenance. Check your equipment warranty terms.

Most residential tune-ups take about an hour per system, depending on its condition.

Yes. L&L Mechanical Services offers HVAC tune-ups as well as HVAC and plumbing maintenance plans.

Change air filters regularly, keep the outdoor unit clear, keep vents unblocked, and watch for unusual noises, smells, or rising energy bills.

Where is L&L Mechanical Services located?

What commercial properties does L&L Mechanical Services serve?

The Maintenance Club is L&L Mechanical Services's membership program for homeowners. For $15 per month, members receive two preventative maintenance visits per year and 20% repair discounts.

The Maintenance Club costs $15 per month.

Members receive two comprehensive visits per year with precision tune-ups, safety inspections of system components, performance evaluations, cleaning and inspection of critical HVAC parts, and efficiency recommendations.

Members receive 20% off repairs on the day of service, 20% off future repairs, and 20% off system accessories.

Yes. Maintenance Club members receive priority attention from L&L Mechanical Services.

Homeowners who want to stay ahead of costly breakdowns, keep their system efficient, and save on repairs are a great fit for the Maintenance Club.

Sign up through the contact page on the L&L Mechanical Services website or call (903) 539-8995.

The membership is designed for year-round protection of heating and cooling systems, with maintenance visits focused on HVAC equipment. Ask L&L Mechanical Services about plumbing coverage.

A maintenance plan can pay for itself by reducing breakdowns, improving efficiency, and lowering repair costs through member discounts.

Regular maintenance reduces the chance of breakdowns during Texas heat waves and cold snaps, and members receive priority attention when problems arise.

L&L Mechanical Services provides leak detection and repair, drain cleaning, repiping, water line installation, sewer line solutions, and water heater repair and replacement for homes and businesses.

Signs of a hidden leak include a rising water bill, the water meter moving when no water is being used, damp spots, stains on walls or ceilings, musty odors, and the sound of running water.

Shut off the main water valve immediately, turn off the water heater if needed, move belongings away from water, and call a plumber.

Low water pressure may be caused by clogged aerators, a failing pressure regulator, a leak, partially closed valves, or corroded pipes.

A running toilet is often caused by a worn flapper, faulty fill valve, or incorrect float setting. Running toilets can waste a lot of water.

Yes. Slab leaks can be repaired by accessing the pipe under the slab or rerouting water lines. The best method depends on the leak location and pipe condition.

Pipes leak from corrosion, high water pressure, age, freezing, shifting soil, and loose or failed fittings.

Insulate exposed pipes, disconnect hoses, cover outdoor faucets, and let faucets drip during hard freezes.

Yes. L&L Mechanical Services provides plumbing services for restaurants, medical offices, retail environments, and other commercial properties, with a focus on minimizing downtime.

Yes. L&L Mechanical Services offers emergency plumbing and HVAC repairs.

Repiping is replacing old or failing water supply pipes throughout a home or building with new piping, commonly PEX or copper.

Repiping may be needed with frequent leaks, corroded galvanized pipes, polybutylene piping, low water pressure, or discolored water.

PEX and copper are the most common repiping materials. PEX is flexible and cost-effective, while copper is durable and long-lasting.

Many residential repipes take a few days, depending on home size, access, and wall repairs.

The main water line carries water from the meter or well into the property. Leaks or breaks can cause low pressure and high water bills.

Wet spots that do not dry, unusually green grass, low pressure, and a spinning water meter with fixtures off are common signs.

Yes. L&L Mechanical Services provides water line installation and repair for residential and commercial properties.

Water line depth varies by local code and utility requirements. Lines are buried deep enough to protect against damage and freezing.

Typically, the utility is responsible up to the meter, and the property owner is responsible from the meter to the building. Rules vary by provider.

Yes. Updated plumbing can reassure buyers and inspectors and reduce the risk of leaks and water damage.

What is repiping?

How long does a tank water heater last?

What is the L&L Mechanical Services Maintenance Club?

Why are some rooms hotter than others?

Tank water heaters typically last about 8 to 12 years, depending on water quality and maintenance.

Signs include running out of hot water, rusty water, rumbling noises, leaks around the base, and a unit older than 10 years.

Tank heaters cost less upfront and are simple to replace. Tankless water heaters provide endless hot water, take less space, and last longer, but cost more to install. L&L Mechanical Services installs both.

Tankless water heaters often last 20 years or more with regular descaling and maintenance.

Many experts recommend about 120 degrees Fahrenheit to reduce scalding risk and energy use.

Popping or rumbling noises usually come from sediment buildup in the tank. Flushing the tank can help.

Tank water heaters should be flushed about once a year, and tankless units should be descaled annually.

An expansion tank absorbs the extra volume created as water heats, reducing pressure on pipes and the water heater in closed plumbing systems.

Leaks from valves or connections can often be repaired, but a leaking tank itself usually means replacement.

Yes. L&L Mechanical Services provides water heater repair, replacement, and installation for traditional tank and tankless systems.

Yes. L&L Mechanical Services provides welding and metal fabrication for commercial and industrial clients across East Texas.

Welding services include structural repairs, weld repairs, exhaust system work, ventilation system fabrication, and custom mechanical solutions.

L&L Mechanical Services has worked with rail companies, manufacturing facilities, restaurants, and large commercial properties.

Many welding repairs can be performed on-site depending on the job, access, and safety conditions. Contact L&L to discuss your project.

Metal fabrication is the process of cutting, shaping, and welding metal to create custom parts, supports, ductwork, or structures.

Yes. L&L Mechanical Services fabricates ventilation system components for commercial and industrial applications.

Commercial and industrial systems often require custom supports, exhaust, and structural work alongside HVAC and plumbing. One team can handle all of it.

Industrial welding follows OSHA safety requirements and industry practices for fire prevention, ventilation, and protective equipment.

Yes. Weld repairs can restore damaged structural components when performed correctly and to appropriate standards.

Contact L&L Mechanical Services at (903) 539-8995 with details about your project.

Does L&L Mechanical Services offer welding?

Why is my AC blowing warm air?

What plumbing services does L&L Mechanical Services offer?