Where is it said that a household's blessings depend on the merits of the wife?

I found several quotes that might be what you're looking for:

The wisest of women, each one built her house... -- Proverbs 14:1.

A man who dwells with no wife, lives without joy, without blessing, and without goodness -- Talmud Yevamot 62b.

One should always be meticulous about respecting his wife, because blessing is only present in the house because of the wife's merit, as it is said (Genesis 12:16), "And he benefited Abram for [Sarah's] sake." Hence [the Talmudic sage] Rava told the inhabitants of Mechuzah: "Respect your wives in order that you should become wealthy!" -- Talmud Bava Metziah 59a.

One who does not have a wife lacks five things: blessing, life, joy, assistance and goodness -- Midrash Tehillim ch. 59.

Rabbi Eliezer Posner