I've heard they can benefit each other/work together but don't know much else. Can someone please give me the downlow on what they know? Many thanks.
Lighting and HVAC are normally the two highest electrical expenses in a residential or commercial building. This means that any energy efficiency upgrade focused on these two areas will have considerable effects on the monthly electrical bill. When choosing between lighting or HVAC alternatives, the most important technical specs to watch out for are:
Lighting Efficacy - It is measured in lumens per watt. For a given illuminance level, lamps with a higher efficacy will be able to accomplish the task with a lower energy input. An upgrade from fluorescent to LED lamps may cut lighting expenses in the range of 40 to 60%.
Lamp Wattage - This is closely related to efficacy, and is a direct indicator of two things:
Lamps with a low wattage save energy directly by reducing their consumption, and indirectly by reducing load on air conditioning equipment.
SEER (Seasonal Energy Efficiency Ratio) - This is similar to efficacy, representing the ratio of cooling output (in Btu/hour) to energy input (in watts). A SEER 26 air conditioner will achieve the same cooling effect with only half the energy consumption of a SEER 13 unit.
COP - An alternative measure that uses watts for both the energy input and cooling or heating output.
A higher SEER or higher COP are indicators of a lower energy consumption for a given heating or cooling load. Retrofitting lamps into LED before upgrading HVAC may also allow the nameplate capacity of HVAC equipment to be reduced! Several tons or air conditioning may be saved if a facility with hundreds of lamps carries out an upgrade to LED.
In reply to Andrew H.:
In reply to Chris Detzel:
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In reply to sunnysunny: