Considerations when going from winter heat to summer cool

When a HVAC system transitions from heating to cooling mode, it requires careful consideration to ensure smooth operation, efficiency, and comfort. The process of switching between these two modes is not just a simple flip of a switch; it involves a range of mechanical, electrical, and operational factors that need to be considered. Of all the systems in your home, your heating and cooling units are among the most complex and its recommended that you let a licensed, skilled, and experienced professional – like the experts at One Hour Heating and Air - handle your seasonal switch-over.

Before we begin: It’s important to understand your system design and capabilities. HVAC systems are designed as heat pumps, which can reverse the direction of refrigerant flow, making them capable of both heating and cooling. Other systems may require separate components for each mode, such as a furnace for heating and an air conditioner for cooling.

For heat pump systems, the refrigerant must be able to flow in both directions depending on whether the system is in heating or cooling mode. A reversing valve is typically employed to switch the direction of refrigerant flow. Understanding the specifics of the HVAC system design helps prevent any operational issues during the transition and ensures that the system is optimized for both modes.

Top 7 considerations to keep in mind when a HVAC system goes from heating to cooling mode:

 

  1. Thermostat Settings and Calibration: A well-calibrated the thermostat ensures that the desired temperature is maintained, and that the HVAC system operates efficiently.
  • When switching from heating to cooling, the thermostat settings must be adjusted to reflect the different temperature requirements.
  • Many modern thermostats allow users to set a desired temperature range, known as a "deadband," which is the range in which neither heating nor cooling occurs. This helps prevent the system from constantly cycling between heating and cooling, saving energy.
  • Proper calibration is also crucial because if the thermostat is inaccurate or poorly calibrated, the system may not switch modes correctly, leading to overcooling, overheating, or excessive energy consumption.
  1. Seasonal Maintenance: This should be scheduled at the start of the cooling season and is critical for the system to operate efficiently and prevent failures.
  • Condenser coils, as one example, should be cleaned to ensure proper heat dissipation during cooling mode. Dirty coils can lead to reduced efficiency, higher energy consumption, and potential damage to the system.
  • Similarly, air filters need to be replaced or cleaned, as clogged filters restrict airflow, which can reduce both heating and cooling efficiency.
  • Checking the refrigerant levels is also crucial during seasonal maintenance. If the refrigerant is low, the system may not cool effectively, and in some cases, it could even damage the compressor. This is definitely one area where a licensed One Hour Heating and Air expert should check and recharge refrigerant, as necessary.
  1. Ensuring Energy Efficiency: Heating and cooling modes place different demands on the system. In heating mode, the system might rely on a furnace, heat pump, or electric resistance elements, whereas cooling mode involves the compressor and refrigerant to absorb and expel heat.

In order to improve energy efficiency during the transition:

  • Consider the SEER (Seasonal Energy Efficiency Ratio): SEER ratings are a measure of an air conditioner’s cooling efficiency. The higher the SEER rating, the more energy-efficient the system is in cooling mode. Your unit’s SEER rating can be found on a large sticker (usually yellow) placed directly on the unit.
  • Variable speed systems: Some modern HVAC systems feature variable-speed compressors and fans that adjust to the cooling load, providing more efficient operation as the system transitions to cooling.
  • Smart thermostats: Smart thermostats can optimize energy use by learning your schedule and adjusting the system’s operation to reduce energy consumption while maintaining comfort.

 

  1. Airflow and Ductwork Considerations: Ensuring that ductwork is properly sized and free of obstructions is central to maintaining balanced airflow.
  • During the heating season, ducts may have been blocked or closed to prevent over-heating certain areas. In cooling mode, the system needs to ensure that cool air reaches every room in the building. Checking for leaks or blockages in the duct system can help reduce energy loss and improve overall system efficiency.
  • Additionally, the type of air filter used can impact airflow. For example, a thick or dense filter might restrict airflow when the system is in cooling mode, leading to reduced efficiency and potential strain on the system.
  1. Indoor Humidity Control: Cooling mode typically introduces a need for better humidity control. As the air conditioner operates, it cools the air by removing moisture, which is one of the key benefits of air conditioning. However, when transitioning from heating to cooling, it's important to check that humidity control is functioning properly, as excess moisture can lead to discomfort and potential mold growth.
  • Systems that include built-in dehumidification may be advantageous during the cooling season, as they help maintain indoor air quality and comfort.
  • If an HVAC system does not have a built-in dehumidifier, using a standalone unit can complement the system during the warmer months.
  1. Timing of the Transition: The timing of the switch from heating to cooling mode should be carefully considered, especially in regions with variable climates.
  • In the spring and fall, outdoor temperatures can fluctuate widely, meaning that the HVAC system might need to provide both heating and cooling on different days or even within the same day. Many modern systems, especially heat pumps, are designed to handle both transitions.
  • For systems that rely on separate heating and cooling components, the switch requires more precise monitoring and control. It’s essential to avoid abrupt temperature changes that could cause unnecessary wear on the system.
  • Call your local One Hour Heating and Air professionals today and we can get you scheduled on the right timeframe for optimal performance.
  1. System Durability and Lifespan: Frequent cycling between heating and cooling modes can place additional strain on the HVAC system, particularly if the system is older or has not been properly maintained.
  • To prolong the lifespan of the system, it’s important to address any wear and tear, such as worn-out components or refrigerant leaks, before switching modes.
  • Regular inspections and prompt repairs can prevent minor issues from escalating into more significant and costly problems. If the system is older or inefficient, it might be worth considering an upgrade to a more modern and reliable unit.

One Hour Heating and Air offers an easy online (and downloadable) checklist for both spring and winter transitions for your HVAC system. We highly recommend letting a professional handle this important and complex process for you, no matter the age of your units. Top of Form

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