Affect and effect cause a great deal of confusion because the spellings are so similar. My advice about them might surprise you: don’t use affect at all.
Affect is a vague word that tells your readers nothing:
The new zoning law will affect the value of our property. VAGUE
Will your property be worth more…or less? “Affect” doesn’t tell you.
The new zoning law will lower the value of our property. BETTER
The new zoning law will increase the value of our property. BETTER
What about effect? It means “a result.” Here’s a trick: Try inserting the in your sentence and see if it works. If it does, chances are you have the right spelling.
We hired a consultant to help us explore the effects of the school proposal. CORRECT