Having green lacewings in your house can be because of the light and shelter they are seeking from cold weather or the elements.
Green lacewings can also be attracted to your house if you have aphids and other pests that they feed on.
Green lacewings are drawn to lights, which can lead to them coming indoors and they will seek areas where they find insects they love to feed on.
They may have also came into the house by getting into your clothes or shoes etc.
Lacewing bugs don't tend to bite although lacewing larvae do sometimes bite humans but it's a common thing that occurs.
The bite itself from the lacewing larvae is not harmful but can cause some skin redness and skin irritation.
Lacewing flies are not harmful to humans or pets.
And instead lacewing flies are actually considered to be beneficial, especially for gardens and garden environments.
Lacewing flies are known to prey on various garden pests, which include whiteflies and aphids.
And although it's possible that lacewing larvae can occasionally bite humans and cause minor skin irritation they are not a great threat to humans and pets and are more helpful and beneficial than they are harmful.
The lacewing larvae and lacewings are voracious predators and eat a wide range of soft bodied insects including whiteflies, mites and aphids.
And the lacewings are a very effective natural control agent for many different garden pests, and help to reduce the need for using chemical pesticides.
Lacewings do not directly harm plants either as their main food source is eating other insects and the lacewings also do not damage plant tissue.
Lacewing larvae do possess mandibles which can be used for defense or to feed on other insects and in rare cases they have bitten humans but it's not often.
And if a lacewing larvae does bite you it's often just a minor irritation and not a serious issue.