Lennox is the leader in advanced, energy-efficient HVAC systems that provide reliable comfort for light commercial buildings. From retail stores to restaurants, schools to healthcare facilities, Lennox HVAC systems are designed to improve comfort, reduce total cost of ownership, protect indoor air quality and simplify installation and maintenance. Choose from a wide range of innovative systems including Lennox VRF, Packaged Rooftop Units, Solar-Ready Systems, Commercial Controls, Split Systems, Mini-Split Systems, Heating Systems, Indoor Air Quality Systems and Energy Star® Products.There are many types, manufacturers, and sizes of commercial HVAC systems which can make it difficult to create general guidelines for repair procedures and estimates for hail-damaged units. This guide uses the most common “light commercial” rooftop units (RTUs), which are 5-tons, 7.5-tons, and 10-tons in capacity, for estimating time to repair or replace. Defining Hail Damage to an RTU

Hail damages a condenser coil when it impacts and bends the fins which prevents the appropriate airflow across the coil and inhibits cooling of the refrigerant. If the refrigerant is not cooled the system can overheat reducing the life of the unit. Coils are designed with extra capacity to allow for some reduction in airflow due to debris in the coils or minor bending of the fins, but proper practices to maintain unobstructed coils is important for extending the life of the unit. Repair versus Replacing Damaged Coils It is uncommon for the coil of the system to be so badly dented that the only way to return the unit to preloss condition is to replace the coil or entire unit. Hail typically does not have the mass or fall at the required trajectory to impact the coil with enough force to cause it to leak refrigerant, which would require more invasive repairs. Most of the hail impact’s energy is lost when it bends the fins on the condenser coil and the refrigerant tubing behind the fins is left unaffected.

If the coil is leaking refrigerant there is typically a noticeable oil spot at the impact or on the roof below the impact. Occasionally a coil may not be able to be combed because the fins are too closely spaced together to place a comb between them, the fins are too brittle and break when they are combed, or the cost to comb the coil exceeds the cost of replacing it. floor standing ac disadvantagesIn these instances a replacement coil needs to be installed or the unit replaced if the coil is no longer manufactured.1.5 ton ac btu Combing is the most efficient way to repair coils and by far the most common repair method recommended by Donan’s forensic technicians. portable ac units for camperAbout 85% of Donan hail studies recommend repairing the unit by combing the coil.

To comb a coil, a plastic or light gauge metal comb or a precision blade is inserted between the fins and pulled down to straighten them and allow the appropriate airflow to cross the coil. This is a tedious process and can take a contractor from two to four hours to perform at an hourly rate of $150 per hour, but $300 to $600 is much more reasonable than the cost to replace a coil ($3,000 to $5,000) or replace the RTU ($10,000 to $20,000). Donan forensic technicians follows the scientific method when determining if the RTU can be repaired and if the damaged coil has caused a reduction in a unit’s efficiency and capacity. The steps to the site study are: Assessing hail damage to RTUs can be complex, especially when common myths about the effects of hail damage abound. A process grounded in years of experience and technical expertise, and vetted through sound scientific principles, can help ensure accurate, confident claims decisions are made.Many multifamily housing structures and businesses need rooftop HVAC units to properly heat and cool apartments, offices, condos and more.

Our selection of rooftop HVAC units includes options that will help you customize the perfect solution for your heating and cooling needs. Not only will your HVAC unit be installed by our expert team of highly trained HVAC technicians – you can also enjoy the peace of mind that comes with knowing we’re here with 24-hour emergency service throughout the year, ensuring you always have a service professional when you need one. Shipley Energy technicians installing a rooftop HVAC unit atop a commercial client's building in Dover, PA. Many people don’t understand how implementing Planned Maintenance  lowers the total ownership costs of an HVAC system. See the example below for an explanation along with some other benefits you may never have considered. Cost for energy to operate unit* Cost for planned maintenance* Total HVAC cost (add 1-4) Total Annual Cost of Ownership * During the life of the unit (15 years) The total HVAC cost divided by the number of years the equipment is in service;

results in your unit cost per year. (The industry standard for the useful economic life expectancy of a rooftop HVAC unit is 12 to 15 years.) A rooftop unit is expensive to purchase, maintain, operate and replace. By instituting a comprehensive Planned Maintenance Program, you will increase your efficiency, save energy and experience fewer breakdowns — ultimately spending less money. Benefits of planned maintenance programs also include: Increased employee productivity by providing a comfortable, clean work environment. By introducing outside or fresh air, you will flush out volatile organic compounds and improve your indoor air quality. If your air filters are changed regularly and the proper amount of outside or fresh air is introduced into your facility, your employees will be healthier. Providing a comfortable workplace can reduce employee turnover. If an employee is uncomfortable on the job he might begin looking for better working conditions. A steady flow to your operation because there is no disruption caused by unplanned breakdowns.