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= Estimated costs  =
 
= Estimated costs  =
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The cost for to build a solar air heater varies significantly depending on whether the materials are purchased "new" or if they were salvaged. In addition, the decision between glass and plexiglass has a very large impact on total cost of the system. Finally, there are other factors such as the use of a fan, solar panels, back-up battery, wires and sheet metal that could be incorporated in the design and would certainly increase the budget.
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{| width="200" border="1" cellpadding="1" cellspacing="1"
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|
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'''Item'''
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| '''Cost'''
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|-
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| Plywood
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| $20
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|-
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| Wood Beams
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| $15
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|-
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| Glass or Plexiglass
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| $40
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|-
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| Sealant
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| $5
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|-
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| Insulation
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| $5
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|-
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| Black Paint
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| $5
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|-
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| Aluminum "L" Trim
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| $3
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|-
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| Screws
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| $2
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|}
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<br>Overall, a basic system can be constructed for approximately $95, which could easily be reduced by being resourceful when gathering the components.&nbsp;
    
= Alternative designs  =
 
= Alternative designs  =
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