Will Replacing an Old Mini Split with a New One Consume Less Electricity?

When considering whether to replace your very old mini split with a new one, it is important to evaluate several factors, including the condition of the existing unit, recent maintenance issues, and the overall energy efficiency of the new system. This article delves into these aspects to help you make an informed decision.

Old vs. New Mini Split Systems

The transition from an old mini split to a new one involves evaluating several key areas, particularly focusing on their performance, maintenance, and energy consumption.

Very Old Mini Split

Moving parts are worn out, reducing overall efficiency. Buildup in the coil reduces heat transfer, leading to decreased performance. Higher maintenance costs due to frequent repairs. Increased noise levels due to wear and tear. Potential for installation damages due to age and condition.

New Mini Split

Benefits from new technologies and advanced control features, enhancing user comfort and ease of operation. Better sound acoustics, creating a more pleasant environment. Reduced energy consumption, contributing to lower electricity bills. Improved reliability and extended service life compared to older models.

While these comparisons offer some insights, the actual energy consumption and cost savings depend on various factors and individual circumstances. It is important to verify these claims through personal assessment or professional evaluation.

Assessing Your Existing Mini Split System

Before deciding on a replacement, it is crucial to conduct a thorough assessment of your current mini split system. Here are some steps to follow:

Check the Current Draw

Measure the current draw of the condensing unit when it is running. Compare this value with the recommended specifications provided in the manufacturer's catalog.

Measure Indoor Airflow and Coil Temperatures

Measure the airflow and coil temperatures inside the unit. Calculate the cooling capacity using the formula: Coil Temperature Rise x Air Density x Specific Heat of Air x Air Flow. Compare this calculated value with the cataloged cooling capacity to identify any potential issues.

Decision Factors

The decision to replace your mini split should take into account several factors:

Replacement Costs vs. Efficiency Gains

Assuming you are replacing the system "like for like" in terms of tonnage or BTUs, you should compare the SEER (Seasonal Energy Efficiency Ratio) ratings of the new and old units. A higher SEER rating indicates greater efficiency and lower long-term operational costs. While a very good old unit might still perform well, a poorly constructed new unit could have lower efficiency, potentially negating the benefits of the replacement.

Remember, efficiency ratings are a key factor, and while initial costs may be cheaper, the long-term savings can often offset the difference. Additionally, some states offer rebates or incentives for purchasing higher SEER units, which can further reduce the overall cost.

Performance Decline and Reliability

If your existing unit is already 10 years old or more, and has seen significant deterioration in performance, it might be worth considering a replacement. Modern mini splits, especially those with better refrigerants like R410A, can offer improved reliability and better performance.

Conclusion

Replacing your old mini split with a new one can indeed lead to lower electricity consumption and cost savings in the long run, provided you make an informed decision based on the efficiency ratings and overall performance of the new unit. Always consider the specific needs and conditions of your household to ensure the best possible outcome.

If you find your existing unit is on the verge of failure or has multiple maintenance issues, a replacement could be a wise investment. However, also explore the potential benefits of insulation upgrades and energy-efficient practices, as these can also contribute to a more efficient cooling environment.