Extreme Heat 

As temperatures increase, air conditioners need to run longer and harder to achieve the desired cooling. Consequently, components such as compressors and condensers undergo more than the standard wear and tear. If not properly maintained to meet rigorous demands, equipment may not be able to cool a space adequately. This means it will potentially consume more energy, increase energy bills, and negatively impact the system owner’s bank account, as well as the environment. Equipment could also overheat, break down, require costly repairs, and reach end of life more quickly. In addition, higher temperatures, longer run times, and increased condensing pressure may lead to more leaks. 

Contractors should take the following steps to help HVACR system owners beat the heat: 

• Check air filters frequently and replace them as needed, remembering that dust and debris can accumulate quickly in hot, dry weather; 

• Perform comprehensive regular maintenance, including cleaning condenser coils and maintaining proper refrigerant levels; 

• Optimize settings. Raising the thermostat slightly when daily temperatures peak can help reduce energy consumption and wear and tear on components; 

• Work with facility managers to ensure proper building insulation. This can reduce heat gain and lessen the burden on air conditioning systems; and 

• Create shade for outdoor units and keep them clear of debris. Protection from direct sunlight can help maintain cooler operating temperatures. 

Humidity 

Indoor comfort and HVACR system performance depend on maintaining the right humidity balance. If humidity is too high, systems will have to work harder to remove moisture from the air while simultaneously providing the desired level of cooling. When humidity is too low, air is dry and static, leading to discomfort for occupants and potential issues with air quality and system operation.  

Tips for high-humidity situations: 

• Keep tabs on moisture buildup and perform regular cleaning of components such as ducts, filters, and evaporator coils. Identifying and removing moisture accumulation can prevent damage from mold or corrosion; 

• Ensure proper insulation of ductwork to help mitigate moisture buildup; 

• Enhance dehumidification systems and make sure they are properly sized to handle specific humidity levels; and 

• Check air filters, blowers, condensate drains, and ductwork to ensure proper airflow. 

Tips for low-humidity situations: 

• Install humidifiers. Consider humidifiers that can be integrated with the heating/cooling system to achieve a consistent level of approximately 30% to 50% relative humidity; 

• Perform regular humidifier maintenance, including cleaning and replacing filters, checking for mineral deposits, and ensuring all lines are clear; 

• Ensure proper insulation of ductwork and seal any leaks; and 

• Perform regular maintenance checks of HVACR systems as noted above. 

Extreme Weather Events 

Severe thunderstorms, snowstorms, and windstorms can cause a number of issues — from power outages and surges to flooding and high winds — that can physically damage HVACR equipment and lead to system failure. While always prioritizing technician safety, it’s important to assess damage as quickly and thoroughly as possible, and then implement the necessary repairs or replacements. Ways contractors can support system resilience during extreme weather events include: 

• Conducting routine maintenance as noted in factors one and two above; 

• Working with facility managers to ensure buildings have proper insulation and weatherproofing; and 

• Having emergency backup power sources in place. Ensuring continual operation during power outages is especially important for mission-critical systems. 

Of course, humans cannot control the weather, or how often and to what extreme it might change in a given season or across the span of a year. However, contractors can pursue best practices that give them the agility to protect HVACR systems from all the elements — helping to ensure adequate heating and cooling, reduce unnecessary repair and energy costs, and provide optimal occupant comfort.