Frequently Asked HVAC & Electrical Questions

Welcome to the FAQ page of Liam Services, your trusted HVAC and electrical experts in Hockessin, DE. As the leading professionals in the field, we are committed to providing expert guidance and solutions to address all your HVAC and electrical needs. Whether you have questions about air conditioning, heating systems, electrical installations, or general maintenance, you’ve come to the right place.

Our team of highly skilled HVAC technicians and electricians possesses extensive knowledge and experience in the industry. We understand that navigating the complexities of HVAC and electrical systems can be daunting, and that’s why we’ve compiled this comprehensive FAQ page to address some of the most common inquiries we receive. If you don’t find what you’re looking for, don’t hesitate to reach out to our knowledgeable team for personalized assistance.

To change the filter in your home air conditioner, follow these steps:

  • Locate the Filter: The filter is typically located near the air handler or return air vent. It may be behind a grille or in a slot on the side or bottom of the unit.
  • Turn Off the System: Before removing the filter, switch off the air conditioner at the thermostat to prevent the system from running during the filter replacement.
  • Remove the Old Filter: Slide out the old filter from its housing. Pay attention to the airflow direction indicated on the filter frame to ensure proper installation of the new filter.
  • Clean or Replace: If the filter is washable, follow the manufacturer’s instructions to clean it thoroughly. If it is disposable, discard the old filter.
  • Install the New Filter: Insert the new filter into the filter slot, ensuring it is aligned with the airflow direction marked on the filter frame.
  • Turn On the System: After installing the new filter, switch on the air conditioner and verify that it is running properly.

Remember to check and replace the filter regularly, typically every one to three months, or as recommended by the manufacturer, to maintain efficient operation and good indoor air quality in your home.

When your AC unit is not blowing cold air, there are a few steps you can take to troubleshoot the issue:

  • Check the Thermostat: Ensure that the thermostat is set to the desired temperature and cooling mode. If it’s set correctly but the air is still not cold, move on to the next steps.
  • Inspect the Air Filter: A dirty or clogged air filter can restrict airflow and reduce cooling efficiency. Check the filter and replace it if it’s dirty.
  • Examine the Outdoor Unit: Inspect the outdoor unit for any obstructions, such as debris or vegetation, that might be blocking airflow. Clear away any obstructions and ensure that the unit has proper clearance.
  • Check the Air Vents: Ensure that all air vents and registers inside your home are open and unobstructed. Blocked vents can restrict airflow and impact cooling performance.
  • Check the Condenser Coils: Dirty or clogged condenser coils can hinder heat transfer and affect cooling. Clean the coils if they appear dirty or contact a professional for professional coil cleaning.

If these troubleshooting steps do not resolve the issue, it is recommended to contact a professional HVAC technician to diagnose and repair the problem.

Yes, air purifiers can help with mold by capturing and removing mold spores from the air. Mold spores are tiny airborne particles released by mold colonies, and they can trigger allergies and respiratory problems when inhaled.

Air purifiers equipped with High-Efficiency Particulate Air (HEPA) filters are particularly effective at removing mold spores. HEPA filters are designed to capture particles as small as 0.3 microns, which includes most mold spores. When air passes through the purifier, the HEPA filter traps and retains the mold spores, preventing them from circulating in the indoor air.

However, it’s important to note that air purifiers alone may not completely eliminate mold growth or address the underlying cause of mold. If you have a significant mold problem in your home, it is crucial to identify and remediate the source of moisture that is promoting mold growth. This may involve professional mold remediation services and addressing any water leaks or excessive humidity.

In summary, while air purifiers can help reduce airborne mold spores, they should be used as part of a comprehensive mold prevention and remediation strategy.

No, not all HVAC units have an air handler. The presence of an air handler in an HVAC system depends on the type of system being used. An air handler is a key component of systems that use forced air for heating, ventilation, and air conditioning.

In central HVAC systems, which are common in residential and commercial buildings, an air handler is typically included. It is responsible for circulating and distributing conditioned air throughout the building. The air handler contains the blower fan, evaporator coil, and filter.

However, there are other types of HVAC systems that do not use air handlers. For example, ductless mini-split systems consist of an outdoor condenser unit and one or more indoor air handling units, eliminating the need for a centralized air handler. Similarly, window units and portable air conditioners do not have a separate air handler.

The presence of an air handler depends on the specific design and configuration of the HVAC system, and different systems may utilize different components for air circulation and conditioning.

Air sealing is the process of closing gaps, cracks, and leaks in a building’s envelope to prevent the uncontrolled movement of air between the interior and exterior. It is an important step in improving energy efficiency, indoor comfort, and reducing utility costs.

The process of air sealing typically involves the following steps:

  • Inspection: A thorough inspection is conducted to identify areas of air leakage, such as around windows, doors, electrical outlets, vents, and pipes.
  • Caulking and Weatherstripping: Gaps and cracks in building materials are sealed using caulk, while weatherstripping is applied to create a tight seal around movable components like doors and windows.
  • Air Barrier Installation: Additional measures, such as installing vapor barriers, air barriers, or membranes, may be taken to create a continuous barrier against air leakage.
  • Duct Sealing: Ductwork is inspected for leaks and sealed using appropriate materials to prevent conditioned air from escaping or unconditioned air from entering.
  • Testing and Verification: After air sealing, a blower door test may be performed to measure the effectiveness of the sealing and identify any remaining leaks.

Air sealing helps to enhance indoor comfort, reduce energy waste, and improve the overall performance of the building’s heating and cooling systems. Consulting with professionals in the field, such as energy auditors or insulation contractors, can ensure effective air sealing practices are implemented for maximum benefit.

The cost of installing a dehumidifier can vary depending on several factors, including the type of dehumidifier, the size of the space, and the complexity of the installation. On average, the cost of installing a dehumidifier ranges from $1,000 to $3,000.

The price of the dehumidifier unit itself can vary based on its capacity, features, and brand. Basic portable or small-capacity dehumidifiers are more affordable, while larger or whole-house dehumidifiers tend to be more expensive.

In addition to the cost of the dehumidifier, you may also need to consider installation labor charges. If the installation requires complex ductwork or electrical modifications, it can increase the overall installation cost.

It is recommended to consult with a professional HVAC contractor or dehumidifier installer to assess your specific needs and provide an accurate cost estimate. They will consider factors such as the size of the area, humidity levels, and any additional installation requirements to determine the most suitable dehumidifier and provide an estimate for the installation cost.

Yes, ductless air conditioning systems, also known as ductless mini-split systems, are generally considered to be more energy-efficient and cost-effective to run compared to traditional central air conditioning systems with ductwork.

Ductless AC systems operate on a “zoned” cooling principle, meaning they provide individualized climate control to specific areas or rooms in a building. This targeted cooling allows for greater energy efficiency as you can cool only the areas that are occupied, rather than cooling the entire home or building. It eliminates the energy losses that occur in ductwork, which can account for a significant portion of energy waste in central AC systems.

Furthermore, ductless AC systems use inverter technology that allows them to adjust their cooling capacity based on the current cooling demands, providing precise and efficient cooling without frequent cycling on and off.

While the upfront cost of installing a ductless AC system may be higher than that of a traditional central AC system, the long-term energy savings and reduced operating costs often offset the initial investment. It is recommended to consult with an HVAC professional to evaluate your specific cooling needs and determine the most cost-effective option for your situation.

When it comes to choosing the best ductwork for ventilation, several factors should be considered, including efficiency, durability, noise reduction, and cost. Here are a few commonly used types of ductwork:

  • Sheet Metal Ducts: Sheet metal ducts, typically made of galvanized steel, are durable and long-lasting. They have smooth interiors, which minimizes airflow resistance and improves efficiency. However, they can be more expensive to install and require skilled labor.
  • Flexible Ducts: Flexible ducts are made of a combination of plastic and metal wire coils. They are flexible and easy to install, making them suitable for tight spaces and retrofitting. However, they may have higher airflow resistance and are more prone to damage if not installed properly.
  • Fiberglass Ducts: Fiberglass ducts are lightweight and have good thermal insulation properties. They help to reduce energy loss and condensation. However, they can be more expensive and require careful installation to prevent fiberglass particles from entering the airflow.
  • Duct Board: Duct board consists of insulation material faced with a fiberglass mat. It provides both insulation and structural support, making it a cost-effective option. However, it may require professional installation and careful sealing to prevent air leakage.

The best choice of ductwork for ventilation depends on the specific requirements of your HVAC system, building design, and budget. Consulting with an HVAC professional can help you determine the most suitable ductwork for your needs.

To turn on emergency heat in your HVAC system, follow these general steps:

  • Locate the thermostat: Find your thermostat and ensure it is set to the “Heat” mode.
  • Access the emergency heat option: Look for a switch or setting on your thermostat labeled “Emergency Heat” or “Auxiliary Heat.” This switch is typically located on the thermostat itself or in a submenu if your thermostat has a digital interface.
  • Activate emergency heat: Flip the switch or select the “Emergency Heat” option on your thermostat. This action will bypass the heat pump and activate the auxiliary heat source, usually electric resistance heat strips.
  • Adjust the temperature: Set the desired temperature on your thermostat to initiate the emergency heat operation. The auxiliary heat source will provide warmth until the desired temperature is reached.
  • Note: Emergency heat should be used sparingly and primarily in situations where the primary heat source (such as the heat pump) is not functioning properly. It is not recommended to use emergency heat as a regular heating option, as it can be less energy-efficient and costlier to operate compared to the primary heat source.

If you are unsure about the specific steps for activating emergency heat on your HVAC system, it is recommended to consult your system’s user manual or contact a professional HVAC technician for guidance.

During an energy audit, a comprehensive assessment of a building’s energy usage and efficiency is conducted to identify areas for improvement. Here are the key steps typically involved in an energy audit:

  • Initial assessment: The auditor collects information about the building, including its size, occupancy patterns, and energy consumption history.
  • On-site inspection: The auditor examines various components of the building, such as insulation, windows, HVAC systems, lighting, appliances, and water heaters. They may also conduct a blower door test to assess air leakage.
  • Data collection: Energy usage data is collected from utility bills and meter readings to analyze patterns and trends.
  • Analysis: The auditor analyzes the collected data and inspects the building’s systems and components to identify areas of inefficiency and potential energy-saving opportunities.
  • Recommendations: Based on the findings, the auditor provides recommendations for energy-saving measures, including improvements to insulation, weather sealing, HVAC system upgrades, lighting retrofits, and behavioral changes.
  • Report: A detailed report is prepared, summarizing the findings, recommendations, and estimated savings potential. It may include cost estimates, payback periods, and information about available incentives or rebates.

By conducting an energy audit, building owners can gain insights into their energy consumption patterns, identify areas for improvement, and make informed decisions about energy-saving upgrades that can enhance efficiency, reduce energy waste, and lower utility costs.

The most energy-efficient furnace options available today are high-efficiency condensing furnaces. These furnaces utilize advanced technology to maximize energy efficiency and reduce energy waste. Here are some key features of high-efficiency condensing furnaces:

  • Condensing technology: These furnaces have a secondary heat exchanger that extracts additional heat from the combustion gasses. This allows them to achieve higher efficiency by capturing and utilizing heat that would otherwise be wasted.
  • Two-stage or modulating burners: High-efficiency furnaces often incorporate two-stage or modulating burners, which can adjust the heating output based on the heating demands. This provides more precise and efficient heating, reducing energy consumption and improving comfort.
  • AFUE rating: The Annual Fuel Utilization Efficiency (AFUE) rating measures the furnace’s efficiency. High-efficiency condensing furnaces typically have AFUE ratings of 90% or higher, meaning they convert 90% or more of the fuel into usable heat.
  • Energy-saving features: Additional features like variable-speed blowers and smart thermostat compatibility can further enhance energy efficiency by optimizing airflow and adjusting heating cycles based on occupancy and temperature settings.

It’s important to note that the energy efficiency of a furnace also depends on proper sizing, installation, and maintenance. Consulting with a professional HVAC technician can help you determine the most energy-efficient furnace option suitable for your home and ensure its optimal performance.

The main downside of a heat pump is its reduced efficiency in extremely cold temperatures. Heat pumps work by transferring heat from the outside air to heat your home during winter. However, as the outdoor temperature drops, the heat pump’s ability to extract heat diminishes, and supplementary heating may be required. In such cases, the heat pump may activate its auxiliary heat source, such as electric resistance coils, which are less efficient and more expensive to operate.

Another potential downside of heat pumps is their initial cost, as they tend to have a higher upfront investment compared to traditional heating systems. However, the long-term energy savings can often offset this initial expense.

Furthermore, heat pumps require regular maintenance to ensure optimal performance. They rely on refrigerant cycles and complex components that may require professional servicing.

Lastly, in regions with limited access to electricity or areas with frequent power outages, heat pumps may not be the most reliable option as they depend on electricity to operate. In such cases, a backup heating system may be necessary.

Installing a whole house humidifier is a complex task that typically requires professional expertise. While some homeowners may have advanced DIY skills, it is generally recommended to hire a qualified HVAC technician for the installation. Here are a few reasons why professional installation is advised:

  • Sizing and compatibility: Properly sizing and selecting a humidifier that is compatible with your HVAC system and home’s specific needs is crucial. HVAC technicians have the knowledge and experience to determine the appropriate size and type of humidifier for your home.
  • Electrical and plumbing considerations: Whole house humidifiers often require electrical and plumbing connections. Professional technicians are trained to handle these installations safely and in compliance with local building codes.
  • Integration with HVAC system: Integrating a whole house humidifier with your HVAC system requires precise configuration and wiring. HVAC professionals can ensure proper integration and synchronization with your existing HVAC equipment.
  • Warranty and insurance: Professional installation ensures that the humidifier is installed correctly, which may help maintain manufacturer warranties. Additionally, licensed HVAC technicians typically carry insurance, providing liability coverage in case of any installation-related issues.

To ensure a proper and efficient installation, it is advisable to consult with an HVAC professional who can assess your home’s needs, recommend the appropriate humidifier, and ensure a safe and reliable installation.

A comprehensive HVAC maintenance contract should include several key components to ensure the optimal performance and longevity of your heating, ventilation, and air conditioning system. Here are some essential elements that should be included:

  • Regular system inspections: The contract should outline scheduled inspections to assess the overall condition of your HVAC system, including checking for any potential issues or signs of wear and tear.
  • Cleaning and lubrication: The contract should specify the cleaning and lubrication of key components such as coils, fans, motors, and belts. This helps maintain efficient operation and prevents excessive wear.
  • Filter replacement: Regular filter replacement is crucial for good indoor air quality and system efficiency. The contract should include the provision for filter replacement at appropriate intervals.
  • System testing and calibration: The contract should outline procedures for testing and calibrating the system’s controls, sensors, and thermostats to ensure accurate operation and energy efficiency.
  • Priority service and discounts: A maintenance contract often provides priority service in case of system failures or emergencies, along with discounts on repair services and replacement parts.
  • Documentation and reporting: The contract should specify that the technician will provide detailed reports after each service visit, documenting the work performed, any identified issues, and recommendations for repairs or upgrades.

By having a well-defined HVAC maintenance contract in place, you can ensure regular upkeep of your system, identify potential problems early on, and maximize its performance and lifespan. It is recommended to review the contract terms carefully and choose a reputable HVAC company that offers reliable and comprehensive maintenance services.

HVAC memberships, also known as maintenance plans or service agreements, can be worth it for many homeowners. These memberships typically offer annual or biannual maintenance visits for your HVAC system, along with additional benefits. Here are some reasons why HVAC memberships can be beneficial:

  • Regular maintenance: HVAC memberships ensure that your system receives regular maintenance, which can help prevent breakdowns, improve efficiency, and extend the lifespan of your equipment.
  • Priority service: Most HVAC memberships offer priority service, meaning you receive faster response times and priority scheduling for any repairs or emergencies.
  • Cost savings: Some memberships include discounts on repairs, replacement parts, or new equipment purchases, which can help save money in the long run.
  • Peace of mind: Knowing that your HVAC system is being properly maintained and serviced by professionals can give you peace of mind and reduce the stress associated with unexpected breakdowns.
  • Expert advice: HVAC technicians can provide valuable advice on energy-saving measures, system upgrades, and equipment options, helping you make informed decisions about your HVAC system.

However, the value of an HVAC membership ultimately depends on your specific needs and the offerings of the membership plan. It’s important to carefully review the terms and benefits of the membership before signing up to ensure it aligns with your requirements and provides good value for the cost.

The choice between HEPA (High Efficiency Particulate Air) filters and UV (Ultraviolet) light systems depends on the specific air quality concerns you have and the goals you want to achieve. Here’s a comparison of both:

  • HEPA Filters: HEPA filters are highly effective at capturing and trapping small particles, including dust, pollen, pet dander, and some airborne pathogens. They provide mechanical filtration by forcing air through a dense filter material. HEPA filters can help improve overall indoor air quality and are particularly beneficial for individuals with allergies or respiratory conditions. However, they do not eliminate or neutralize microorganisms like bacteria or viruses.
  • UV Light Systems: UV light systems use ultraviolet radiation to kill or inactivate microorganisms such as bacteria, viruses, and mold spores that pass by the light source. They are primarily designed to target biological contaminants. UV light systems can be effective in reducing the presence of these pathogens, but they are less effective against non-living particles like dust or pollen.

HEPA filters are effective for mechanical filtration of particles, while UV light systems are effective for controlling microorganisms. For comprehensive air purification, a combination of both technologies may be beneficial, especially in environments where both particulate matter and biological contaminants are of concern. Consulting with an HVAC professional can help determine the most appropriate solution for your specific needs.



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