Unfortunately, solar panels come with a hefty price tag, similar to the cost of a car, whereas trees (of any portable size) tend to cost less than $100.
You can of course have both, but then the solar panels will not be quite as effective, and for the investment you put in to them, you will want them to be effective.
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"Eco-friendly" light bulbs, quite popular and in stock at most "do it yourself" or retail stores also can be of help here.
If you have a central air / heat pump unit: change or clean filters every 30 days and make sure high weeds or grass are clear of the outside compressor unit; check the grill area also insuring it too is clear of any clogging or obstruction. Maintain an average inside home temperature of 75 degrees.
Many homeowners swear using the "pink fiberglass" insulation around the hot water heater unit can be a huge energy saver. If you choose to do this–do so with a CAREFUL degree of common sense: make sure the insulation doesn’t come near the pilot lighting or electrical component of the heater unit or hampers the operation of the water heater.
And it’s always a good idea every six months to clean sediment out from the heater. Get the safety instructions on how to do this and follow them carefully.
Setting your PC and monitor both to "sleep" modes also can save energy. And it’s a pain in the…..well….you know where….but it’s a true energy saver: Unplug TV sets when no longer used for the evening. Yes: even when turned off, a TV and/or stereo set STILL drains electricity.
Solar panels CAN save some on a home’s utility usage, but constant weather exposure ( wind, snow, hail and yes…..even sun) can cause wear and tear on them—and they aren’t cheap to repair or replace.
Tree shade is another novel approach—until a severe storm, hurricane or tornado brings that tree crashing on your roof, making a "natural" skylight that can prove very costly to repair.
Oh yeah….almost forgot….turn off that light when not in use.
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