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Keeping your HVAC system running efficiently comes down to regular filter swaps, and this 6-pack of MERV 8 filters covers roughly a year or more of changes depending on your usage. Walmart has it at $37, which is $24 off the $61 list price. Buy Now at Walmart

Anyone maintaining a home HVAC system needs a steady supply of filters, and this MERV 8 pleated 6-pack handles standard dust and pollen filtration for about 6 months of coverage; at $39, that's $16 off the $55 list price. Buy Now at Walmart